diff --git a/ipywidgets/_version.py b/ipywidgets/_version.py
index 6ae9f061a6..b1122f826e 100644
--- a/ipywidgets/_version.py
+++ b/ipywidgets/_version.py
@@ -11,7 +11,7 @@
 __protocol_version__ = '2.0.0'
 __jupyter_widgets_base_version__ = '1.0.0'
 __jupyter_widgets_output_version__ = '1.0.0'
-__jupyter_widgets_controls_version__ = '1.1.0'
+__jupyter_widgets_controls_version__ = '1.2.0'
 
 # A compatible @jupyter-widgets/html-manager npm package semver range
 __html_manager_version__ = '^0.11.0'
diff --git a/packages/controls/src/version.ts b/packages/controls/src/version.ts
index 53ac249e2e..d8e97e26b6 100644
--- a/packages/controls/src/version.ts
+++ b/packages/controls/src/version.ts
@@ -6,4 +6,4 @@
  * implements.
  */
 export
-const JUPYTER_CONTROLS_VERSION = '1.1.0';
+const JUPYTER_CONTROLS_VERSION = '1.2.0';
diff --git a/packages/jupyterlab-manager/src/manager.ts b/packages/jupyterlab-manager/src/manager.ts
index 9bde71c5b9..329a13e0d3 100644
--- a/packages/jupyterlab-manager/src/manager.ts
+++ b/packages/jupyterlab-manager/src/manager.ts
@@ -29,6 +29,10 @@ import {
   DocumentRegistry
 } from '@jupyterlab/docregistry';
 
+import {
+  valid
+} from 'semver';
+
 import {
   SemVerCache
 } from './semvercache';
@@ -167,6 +171,17 @@ class WidgetManager extends ManagerBase<Widget> implements IDisposable {
    * Load a class and return a promise to the loaded object.
    */
   protected loadClass(className: string, moduleName: string, moduleVersion: string): Promise<typeof WidgetModel | typeof WidgetView> {
+
+    // Special-case the Jupyter base and controls packages. If we have just a
+    // plain version, with no indication of the compatible range, prepend a ^ to
+    // get all compatible versions. We may eventually apply this logic to all
+    // widget modules. See issues #2006 and #2017 for more discussion.
+    if ((moduleName === "@jupyter-widgets/base"
+         || moduleName === "@jupyter-widgets/controls")
+        && valid(moduleVersion)) {
+      moduleVersion = `^${moduleVersion}`;
+    }
+
     let mod = this._registry.get(moduleName, moduleVersion);
     if (!mod) {
       return Promise.reject(`Module ${moduleName}, semver range ${moduleVersion} is not registered as a widget module`);
diff --git a/packages/jupyterlab-manager/src/plugin.ts b/packages/jupyterlab-manager/src/plugin.ts
index d6ac5e65a2..d4950d5e12 100644
--- a/packages/jupyterlab-manager/src/plugin.ts
+++ b/packages/jupyterlab-manager/src/plugin.ts
@@ -109,29 +109,10 @@ function activateWidgetExtension(app: JupyterLab): base.IJupyterWidgetRegistry {
       StyleView: base.StyleView
     }
   });
-  extension.registerWidget({
-    name: '@jupyter-widgets/controls',
-    version: JUPYTER_CONTROLS_VERSION,
-    exports: () => {
-      return new Promise((resolve, reject) => {
-        (require as any).ensure(['@jupyter-widgets/controls'], (require: NodeRequire) => {
-          resolve(require('@jupyter-widgets/controls'));
-        },
-        (err: any) => {
-          reject(err);
-        },
-        '@jupyter-widgets/controls'
-        );
-      });
-    }
-  });
 
-  // Until we do automatic semver matching (for example, converting a request
-  // for 1.0.0 to ^1.0.0), we register the controls under both the current
-  // version (above) and older versions it can handle.
   extension.registerWidget({
     name: '@jupyter-widgets/controls',
-    version: '1.0.0',
+    version: JUPYTER_CONTROLS_VERSION,
     exports: () => {
       return new Promise((resolve, reject) => {
         (require as any).ensure(['@jupyter-widgets/controls'], (require: NodeRequire) => {
diff --git a/packages/jupyterlab-manager/src/semvercache.ts b/packages/jupyterlab-manager/src/semvercache.ts
index b4b3b9809d..3e4d70fc5e 100644
--- a/packages/jupyterlab-manager/src/semvercache.ts
+++ b/packages/jupyterlab-manager/src/semvercache.ts
@@ -17,6 +17,8 @@ class SemVerCache<T> {
     }
     if (!(version in this._cache[key])) {
       this._cache[key][version] = object;
+    } else {
+      throw `Version ${version} of key ${key} already registered.`;
     }
   }
 
@@ -29,4 +31,4 @@ class SemVerCache<T> {
   }
 
   private _cache: { [key: string]: {[version: string]: T} } = Object.create(null);
-}
\ No newline at end of file
+}
diff --git a/packages/schema/jupyterwidgetmodels.latest.md b/packages/schema/jupyterwidgetmodels.latest.md
index b6cc1d191b..0e629e8eb9 100644
--- a/packages/schema/jupyterwidgetmodels.latest.md
+++ b/packages/schema/jupyterwidgetmodels.latest.md
@@ -45,33 +45,33 @@ Attribute        | Type             | Default          | Help
 `visibility`     | `null` or string (one of `'visible'`, `'hidden'`, `'inherit'`, `'initial'`, `'unset'`) | `null`           | The visibility CSS attribute.
 `width`          | `null` or string | `null`           | The width CSS attribute.
 
-### AccordionModel (@jupyter-widgets/controls, 1.1.0); AccordionView (@jupyter-widgets/controls, 1.1.0)
+### AccordionModel (@jupyter-widgets/controls, 1.2.0); AccordionView (@jupyter-widgets/controls, 1.2.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_dom_classes`   | array            | `[]`             | CSS classes applied to widget DOM element
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'AccordionModel'` | 
 `_titles`        | object           | `{}`             | Titles of the pages
 `_view_module`   | string           | `'@jupyter-widgets/controls'` | 
-`_view_module_version` | string           | `'1.1.0'`        | 
+`_view_module_version` | string           | `'1.2.0'`        | 
 `_view_name`     | string           | `'AccordionView'` | 
 `box_style`      | string (one of `'success'`, `'info'`, `'warning'`, `'danger'`, `''`) | `''`             | Use a predefined styling for the box.
 `children`       | array            | `[]`             | List of widget children
 `layout`         | reference to Layout widget | reference to new instance | 
 `selected_index` | `null` or number (integer) | `0`              | The index of the selected page. This is either an integer selecting a particular sub-widget, or None to have no widgets selected.
 
-### BoundedFloatTextModel (@jupyter-widgets/controls, 1.1.0); FloatTextView (@jupyter-widgets/controls, 1.1.0)
+### BoundedFloatTextModel (@jupyter-widgets/controls, 1.2.0); FloatTextView (@jupyter-widgets/controls, 1.2.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_dom_classes`   | array            | `[]`             | CSS classes applied to widget DOM element
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'BoundedFloatTextModel'` | 
 `_view_module`   | string           | `'@jupyter-widgets/controls'` | 
-`_view_module_version` | string           | `'1.1.0'`        | 
+`_view_module_version` | string           | `'1.2.0'`        | 
 `_view_name`     | string           | `'FloatTextView'` | 
 `continuous_update` | boolean          | `false`          | Update the value as the user types. If False, update on submission, e.g., pressing Enter or navigating away.
 `description`    | string           | `''`             | Description of the control.
@@ -83,16 +83,16 @@ Attribute        | Type             | Default          | Help
 `style`          | reference to DescriptionStyle widget | reference to new instance | Styling customizations
 `value`          | number (float)   | `0.0`            | Float value
 
-### BoundedIntTextModel (@jupyter-widgets/controls, 1.1.0); IntTextView (@jupyter-widgets/controls, 1.1.0)
+### BoundedIntTextModel (@jupyter-widgets/controls, 1.2.0); IntTextView (@jupyter-widgets/controls, 1.2.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_dom_classes`   | array            | `[]`             | CSS classes applied to widget DOM element
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'BoundedIntTextModel'` | 
 `_view_module`   | string           | `'@jupyter-widgets/controls'` | 
-`_view_module_version` | string           | `'1.1.0'`        | 
+`_view_module_version` | string           | `'1.2.0'`        | 
 `_view_name`     | string           | `'IntTextView'`  | 
 `continuous_update` | boolean          | `false`          | Update the value as the user types. If False, update on submission, e.g., pressing Enter or navigating away.
 `description`    | string           | `''`             | Description of the control.
@@ -104,31 +104,31 @@ Attribute        | Type             | Default          | Help
 `style`          | reference to DescriptionStyle widget | reference to new instance | Styling customizations
 `value`          | number (integer) | `0`              | Int value
 
-### BoxModel (@jupyter-widgets/controls, 1.1.0); BoxView (@jupyter-widgets/controls, 1.1.0)
+### BoxModel (@jupyter-widgets/controls, 1.2.0); BoxView (@jupyter-widgets/controls, 1.2.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_dom_classes`   | array            | `[]`             | CSS classes applied to widget DOM element
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'BoxModel'`     | 
 `_view_module`   | string           | `'@jupyter-widgets/controls'` | 
-`_view_module_version` | string           | `'1.1.0'`        | 
+`_view_module_version` | string           | `'1.2.0'`        | 
 `_view_name`     | string           | `'BoxView'`      | 
 `box_style`      | string (one of `'success'`, `'info'`, `'warning'`, `'danger'`, `''`) | `''`             | Use a predefined styling for the box.
 `children`       | array            | `[]`             | List of widget children
 `layout`         | reference to Layout widget | reference to new instance | 
 
-### ButtonModel (@jupyter-widgets/controls, 1.1.0); ButtonView (@jupyter-widgets/controls, 1.1.0)
+### ButtonModel (@jupyter-widgets/controls, 1.2.0); ButtonView (@jupyter-widgets/controls, 1.2.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_dom_classes`   | array            | `[]`             | CSS classes applied to widget DOM element
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'ButtonModel'`  | 
 `_view_module`   | string           | `'@jupyter-widgets/controls'` | 
-`_view_module_version` | string           | `'1.1.0'`        | 
+`_view_module_version` | string           | `'1.2.0'`        | 
 `_view_name`     | string           | `'ButtonView'`   | 
 `button_style`   | string (one of `'primary'`, `'success'`, `'info'`, `'warning'`, `'danger'`, `''`) | `''`             | Use a predefined styling for the button.
 `description`    | string           | `''`             | Button label.
@@ -138,12 +138,12 @@ Attribute        | Type             | Default          | Help
 `style`          | reference to ButtonStyle widget | reference to new instance | 
 `tooltip`        | string           | `''`             | Tooltip caption of the button.
 
-### ButtonStyleModel (@jupyter-widgets/controls, 1.1.0); StyleView (@jupyter-widgets/base, 1.0.0)
+### ButtonStyleModel (@jupyter-widgets/controls, 1.2.0); StyleView (@jupyter-widgets/base, 1.0.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'ButtonStyleModel'` | 
 `_view_module`   | string           | `'@jupyter-widgets/base'` | 
 `_view_module_version` | string           | `'1.0.0'`        | 
@@ -151,16 +151,16 @@ Attribute        | Type             | Default          | Help
 `button_color`   | `null` or string | `null`           | Color of the button
 `font_weight`    | string           | `''`             | Button text font weight.
 
-### CheckboxModel (@jupyter-widgets/controls, 1.1.0); CheckboxView (@jupyter-widgets/controls, 1.1.0)
+### CheckboxModel (@jupyter-widgets/controls, 1.2.0); CheckboxView (@jupyter-widgets/controls, 1.2.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_dom_classes`   | array            | `[]`             | CSS classes applied to widget DOM element
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'CheckboxModel'` | 
 `_view_module`   | string           | `'@jupyter-widgets/controls'` | 
-`_view_module_version` | string           | `'1.1.0'`        | 
+`_view_module_version` | string           | `'1.2.0'`        | 
 `_view_name`     | string           | `'CheckboxView'` | 
 `description`    | string           | `''`             | Description of the control.
 `disabled`       | boolean          | `false`          | Enable or disable user changes.
@@ -169,16 +169,16 @@ Attribute        | Type             | Default          | Help
 `style`          | reference to DescriptionStyle widget | reference to new instance | Styling customizations
 `value`          | boolean          | `false`          | Bool value
 
-### ColorPickerModel (@jupyter-widgets/controls, 1.1.0); ColorPickerView (@jupyter-widgets/controls, 1.1.0)
+### ColorPickerModel (@jupyter-widgets/controls, 1.2.0); ColorPickerView (@jupyter-widgets/controls, 1.2.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_dom_classes`   | array            | `[]`             | CSS classes applied to widget DOM element
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'ColorPickerModel'` | 
 `_view_module`   | string           | `'@jupyter-widgets/controls'` | 
-`_view_module_version` | string           | `'1.1.0'`        | 
+`_view_module_version` | string           | `'1.2.0'`        | 
 `_view_name`     | string           | `'ColorPickerView'` | 
 `concise`        | boolean          | `false`          | Display short version with just a color selector.
 `description`    | string           | `''`             | Description of the control.
@@ -187,45 +187,45 @@ Attribute        | Type             | Default          | Help
 `style`          | reference to DescriptionStyle widget | reference to new instance | Styling customizations
 `value`          | string           | `'black'`        | The color value.
 
-### ControllerAxisModel (@jupyter-widgets/controls, 1.1.0); ControllerAxisView (@jupyter-widgets/controls, 1.1.0)
+### ControllerAxisModel (@jupyter-widgets/controls, 1.2.0); ControllerAxisView (@jupyter-widgets/controls, 1.2.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_dom_classes`   | array            | `[]`             | CSS classes applied to widget DOM element
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'ControllerAxisModel'` | 
 `_view_module`   | string           | `'@jupyter-widgets/controls'` | 
-`_view_module_version` | string           | `'1.1.0'`        | 
+`_view_module_version` | string           | `'1.2.0'`        | 
 `_view_name`     | string           | `'ControllerAxisView'` | 
 `layout`         | reference to Layout widget | reference to new instance | 
 `value`          | number (float)   | `0.0`            | The value of the axis.
 
-### ControllerButtonModel (@jupyter-widgets/controls, 1.1.0); ControllerButtonView (@jupyter-widgets/controls, 1.1.0)
+### ControllerButtonModel (@jupyter-widgets/controls, 1.2.0); ControllerButtonView (@jupyter-widgets/controls, 1.2.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_dom_classes`   | array            | `[]`             | CSS classes applied to widget DOM element
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'ControllerButtonModel'` | 
 `_view_module`   | string           | `'@jupyter-widgets/controls'` | 
-`_view_module_version` | string           | `'1.1.0'`        | 
+`_view_module_version` | string           | `'1.2.0'`        | 
 `_view_name`     | string           | `'ControllerButtonView'` | 
 `layout`         | reference to Layout widget | reference to new instance | 
 `pressed`        | boolean          | `false`          | Whether the button is pressed.
 `value`          | number (float)   | `0.0`            | The value of the button.
 
-### ControllerModel (@jupyter-widgets/controls, 1.1.0); ControllerView (@jupyter-widgets/controls, 1.1.0)
+### ControllerModel (@jupyter-widgets/controls, 1.2.0); ControllerView (@jupyter-widgets/controls, 1.2.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_dom_classes`   | array            | `[]`             | CSS classes applied to widget DOM element
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'ControllerModel'` | 
 `_view_module`   | string           | `'@jupyter-widgets/controls'` | 
-`_view_module_version` | string           | `'1.1.0'`        | 
+`_view_module_version` | string           | `'1.2.0'`        | 
 `_view_name`     | string           | `'ControllerView'` | 
 `axes`           | array            | `[]`             | The axes on the gamepad.
 `buttons`        | array            | `[]`             | The buttons on the gamepad.
@@ -236,16 +236,16 @@ Attribute        | Type             | Default          | Help
 `name`           | string           | `''`             | The name of the controller.
 `timestamp`      | number (float)   | `0.0`            | The last time the data from this gamepad was updated.
 
-### DatePickerModel (@jupyter-widgets/controls, 1.1.0); DatePickerView (@jupyter-widgets/controls, 1.1.0)
+### DatePickerModel (@jupyter-widgets/controls, 1.2.0); DatePickerView (@jupyter-widgets/controls, 1.2.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_dom_classes`   | array            | `[]`             | CSS classes applied to widget DOM element
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'DatePickerModel'` | 
 `_view_module`   | string           | `'@jupyter-widgets/controls'` | 
-`_view_module_version` | string           | `'1.1.0'`        | 
+`_view_module_version` | string           | `'1.2.0'`        | 
 `_view_name`     | string           | `'DatePickerView'` | 
 `description`    | string           | `''`             | Description of the control.
 `disabled`       | boolean          | `false`          | Enable or disable user changes.
@@ -253,42 +253,42 @@ Attribute        | Type             | Default          | Help
 `style`          | reference to DescriptionStyle widget | reference to new instance | Styling customizations
 `value`          | `null` or Date   | `null`           | 
 
-### DescriptionStyleModel (@jupyter-widgets/controls, 1.1.0); StyleView (@jupyter-widgets/base, 1.0.0)
+### DescriptionStyleModel (@jupyter-widgets/controls, 1.2.0); StyleView (@jupyter-widgets/base, 1.0.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'DescriptionStyleModel'` | 
 `_view_module`   | string           | `'@jupyter-widgets/base'` | 
 `_view_module_version` | string           | `'1.0.0'`        | 
 `_view_name`     | string           | `'StyleView'`    | 
 `description_width` | string           | `''`             | Width of the description to the side of the control.
 
-### DirectionalLinkModel (@jupyter-widgets/controls, 1.1.0); None (@jupyter-widgets/controls, 1.1.0)
+### DirectionalLinkModel (@jupyter-widgets/controls, 1.2.0); None (@jupyter-widgets/controls, 1.2.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'DirectionalLinkModel'` | 
 `_view_module`   | string           | `'@jupyter-widgets/controls'` | 
-`_view_module_version` | string           | `'1.1.0'`        | 
+`_view_module_version` | string           | `'1.2.0'`        | 
 `_view_name`     | `null` or string | `null`           | Name of the view.
 `source`         | array            | `[]`             | The source (widget, 'trait_name') pair
 `target`         | array            | `[]`             | The target (widget, 'trait_name') pair
 
-### DropdownModel (@jupyter-widgets/controls, 1.1.0); DropdownView (@jupyter-widgets/controls, 1.1.0)
+### DropdownModel (@jupyter-widgets/controls, 1.2.0); DropdownView (@jupyter-widgets/controls, 1.2.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_dom_classes`   | array            | `[]`             | CSS classes applied to widget DOM element
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'DropdownModel'` | 
 `_options_labels` | array            | `[]`             | The labels for the options.
 `_view_module`   | string           | `'@jupyter-widgets/controls'` | 
-`_view_module_version` | string           | `'1.1.0'`        | 
+`_view_module_version` | string           | `'1.2.0'`        | 
 `_view_name`     | string           | `'DropdownView'` | 
 `description`    | string           | `''`             | Description of the control.
 `disabled`       | boolean          | `false`          | Enable or disable user changes
@@ -296,16 +296,16 @@ Attribute        | Type             | Default          | Help
 `layout`         | reference to Layout widget | reference to new instance | 
 `style`          | reference to DescriptionStyle widget | reference to new instance | Styling customizations
 
-### FloatLogSliderModel (@jupyter-widgets/controls, 1.1.0); FloatLogSliderView (@jupyter-widgets/controls, 1.1.0)
+### FloatLogSliderModel (@jupyter-widgets/controls, 1.2.0); FloatLogSliderView (@jupyter-widgets/controls, 1.2.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_dom_classes`   | array            | `[]`             | CSS classes applied to widget DOM element
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'FloatLogSliderModel'` | 
 `_view_module`   | string           | `'@jupyter-widgets/controls'` | 
-`_view_module_version` | string           | `'1.1.0'`        | 
+`_view_module_version` | string           | `'1.2.0'`        | 
 `_view_name`     | string           | `'FloatLogSliderView'` | 
 `base`           | number (float)   | `10.0`           | Base for the logarithm
 `continuous_update` | boolean          | `true`           | Update the value of the widget as the user is holding the slider.
@@ -321,16 +321,16 @@ Attribute        | Type             | Default          | Help
 `style`          | reference to SliderStyle widget | reference to new instance | 
 `value`          | number (float)   | `1.0`            | Float value
 
-### FloatProgressModel (@jupyter-widgets/controls, 1.1.0); ProgressView (@jupyter-widgets/controls, 1.1.0)
+### FloatProgressModel (@jupyter-widgets/controls, 1.2.0); ProgressView (@jupyter-widgets/controls, 1.2.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_dom_classes`   | array            | `[]`             | CSS classes applied to widget DOM element
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'FloatProgressModel'` | 
 `_view_module`   | string           | `'@jupyter-widgets/controls'` | 
-`_view_module_version` | string           | `'1.1.0'`        | 
+`_view_module_version` | string           | `'1.2.0'`        | 
 `_view_name`     | string           | `'ProgressView'` | 
 `bar_style`      | `null` or string (one of `'success'`, `'info'`, `'warning'`, `'danger'`, `''`) | `''`             | Use a predefined styling for the progess bar.
 `description`    | string           | `''`             | Description of the control.
@@ -341,16 +341,16 @@ Attribute        | Type             | Default          | Help
 `style`          | reference to ProgressStyle widget | reference to new instance | 
 `value`          | number (float)   | `0.0`            | Float value
 
-### FloatRangeSliderModel (@jupyter-widgets/controls, 1.1.0); FloatRangeSliderView (@jupyter-widgets/controls, 1.1.0)
+### FloatRangeSliderModel (@jupyter-widgets/controls, 1.2.0); FloatRangeSliderView (@jupyter-widgets/controls, 1.2.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_dom_classes`   | array            | `[]`             | CSS classes applied to widget DOM element
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'FloatRangeSliderModel'` | 
 `_view_module`   | string           | `'@jupyter-widgets/controls'` | 
-`_view_module_version` | string           | `'1.1.0'`        | 
+`_view_module_version` | string           | `'1.2.0'`        | 
 `_view_name`     | string           | `'FloatRangeSliderView'` | 
 `continuous_update` | boolean          | `true`           | Update the value of the widget as the user is sliding the slider.
 `description`    | string           | `''`             | Description of the control.
@@ -365,16 +365,16 @@ Attribute        | Type             | Default          | Help
 `style`          | reference to SliderStyle widget | reference to new instance | 
 `value`          | array            | `[0.0, 1.0]`     | Tuple of (lower, upper) bounds
 
-### FloatSliderModel (@jupyter-widgets/controls, 1.1.0); FloatSliderView (@jupyter-widgets/controls, 1.1.0)
+### FloatSliderModel (@jupyter-widgets/controls, 1.2.0); FloatSliderView (@jupyter-widgets/controls, 1.2.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_dom_classes`   | array            | `[]`             | CSS classes applied to widget DOM element
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'FloatSliderModel'` | 
 `_view_module`   | string           | `'@jupyter-widgets/controls'` | 
-`_view_module_version` | string           | `'1.1.0'`        | 
+`_view_module_version` | string           | `'1.2.0'`        | 
 `_view_name`     | string           | `'FloatSliderView'` | 
 `continuous_update` | boolean          | `true`           | Update the value of the widget as the user is holding the slider.
 `description`    | string           | `''`             | Description of the control.
@@ -389,16 +389,16 @@ Attribute        | Type             | Default          | Help
 `style`          | reference to SliderStyle widget | reference to new instance | 
 `value`          | number (float)   | `0.0`            | Float value
 
-### FloatTextModel (@jupyter-widgets/controls, 1.1.0); FloatTextView (@jupyter-widgets/controls, 1.1.0)
+### FloatTextModel (@jupyter-widgets/controls, 1.2.0); FloatTextView (@jupyter-widgets/controls, 1.2.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_dom_classes`   | array            | `[]`             | CSS classes applied to widget DOM element
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'FloatTextModel'` | 
 `_view_module`   | string           | `'@jupyter-widgets/controls'` | 
-`_view_module_version` | string           | `'1.1.0'`        | 
+`_view_module_version` | string           | `'1.2.0'`        | 
 `_view_name`     | string           | `'FloatTextView'` | 
 `continuous_update` | boolean          | `false`          | Update the value as the user types. If False, update on submission, e.g., pressing Enter or navigating away.
 `description`    | string           | `''`             | Description of the control.
@@ -408,31 +408,31 @@ Attribute        | Type             | Default          | Help
 `style`          | reference to DescriptionStyle widget | reference to new instance | Styling customizations
 `value`          | number (float)   | `0.0`            | Float value
 
-### HBoxModel (@jupyter-widgets/controls, 1.1.0); HBoxView (@jupyter-widgets/controls, 1.1.0)
+### HBoxModel (@jupyter-widgets/controls, 1.2.0); HBoxView (@jupyter-widgets/controls, 1.2.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_dom_classes`   | array            | `[]`             | CSS classes applied to widget DOM element
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'HBoxModel'`    | 
 `_view_module`   | string           | `'@jupyter-widgets/controls'` | 
-`_view_module_version` | string           | `'1.1.0'`        | 
+`_view_module_version` | string           | `'1.2.0'`        | 
 `_view_name`     | string           | `'HBoxView'`     | 
 `box_style`      | string (one of `'success'`, `'info'`, `'warning'`, `'danger'`, `''`) | `''`             | Use a predefined styling for the box.
 `children`       | array            | `[]`             | List of widget children
 `layout`         | reference to Layout widget | reference to new instance | 
 
-### HTMLMathModel (@jupyter-widgets/controls, 1.1.0); HTMLMathView (@jupyter-widgets/controls, 1.1.0)
+### HTMLMathModel (@jupyter-widgets/controls, 1.2.0); HTMLMathView (@jupyter-widgets/controls, 1.2.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_dom_classes`   | array            | `[]`             | CSS classes applied to widget DOM element
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'HTMLMathModel'` | 
 `_view_module`   | string           | `'@jupyter-widgets/controls'` | 
-`_view_module_version` | string           | `'1.1.0'`        | 
+`_view_module_version` | string           | `'1.2.0'`        | 
 `_view_name`     | string           | `'HTMLMathView'` | 
 `description`    | string           | `''`             | Description of the control.
 `layout`         | reference to Layout widget | reference to new instance | 
@@ -440,16 +440,16 @@ Attribute        | Type             | Default          | Help
 `style`          | reference to DescriptionStyle widget | reference to new instance | Styling customizations
 `value`          | string           | `''`             | String value
 
-### HTMLModel (@jupyter-widgets/controls, 1.1.0); HTMLView (@jupyter-widgets/controls, 1.1.0)
+### HTMLModel (@jupyter-widgets/controls, 1.2.0); HTMLView (@jupyter-widgets/controls, 1.2.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_dom_classes`   | array            | `[]`             | CSS classes applied to widget DOM element
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'HTMLModel'`    | 
 `_view_module`   | string           | `'@jupyter-widgets/controls'` | 
-`_view_module_version` | string           | `'1.1.0'`        | 
+`_view_module_version` | string           | `'1.2.0'`        | 
 `_view_name`     | string           | `'HTMLView'`     | 
 `description`    | string           | `''`             | Description of the control.
 `layout`         | reference to Layout widget | reference to new instance | 
@@ -457,16 +457,16 @@ Attribute        | Type             | Default          | Help
 `style`          | reference to DescriptionStyle widget | reference to new instance | Styling customizations
 `value`          | string           | `''`             | String value
 
-### ImageModel (@jupyter-widgets/controls, 1.1.0); ImageView (@jupyter-widgets/controls, 1.1.0)
+### ImageModel (@jupyter-widgets/controls, 1.2.0); ImageView (@jupyter-widgets/controls, 1.2.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_dom_classes`   | array            | `[]`             | CSS classes applied to widget DOM element
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'ImageModel'`   | 
 `_view_module`   | string           | `'@jupyter-widgets/controls'` | 
-`_view_module_version` | string           | `'1.1.0'`        | 
+`_view_module_version` | string           | `'1.2.0'`        | 
 `_view_name`     | string           | `'ImageView'`    | 
 `format`         | string           | `'png'`          | The format of the image.
 `height`         | string           | `''`             | Height of the image in pixels.
@@ -474,16 +474,16 @@ Attribute        | Type             | Default          | Help
 `value`          | Bytes            | `b''`            | The image data as a byte string.
 `width`          | string           | `''`             | Width of the image in pixels.
 
-### IntProgressModel (@jupyter-widgets/controls, 1.1.0); ProgressView (@jupyter-widgets/controls, 1.1.0)
+### IntProgressModel (@jupyter-widgets/controls, 1.2.0); ProgressView (@jupyter-widgets/controls, 1.2.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_dom_classes`   | array            | `[]`             | CSS classes applied to widget DOM element
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'IntProgressModel'` | 
 `_view_module`   | string           | `'@jupyter-widgets/controls'` | 
-`_view_module_version` | string           | `'1.1.0'`        | 
+`_view_module_version` | string           | `'1.2.0'`        | 
 `_view_name`     | string           | `'ProgressView'` | 
 `bar_style`      | string (one of `'success'`, `'info'`, `'warning'`, `'danger'`, `''`) | `''`             | Use a predefined styling for the progess bar.
 `description`    | string           | `''`             | Description of the control.
@@ -494,16 +494,16 @@ Attribute        | Type             | Default          | Help
 `style`          | reference to ProgressStyle widget | reference to new instance | 
 `value`          | number (integer) | `0`              | Int value
 
-### IntRangeSliderModel (@jupyter-widgets/controls, 1.1.0); IntRangeSliderView (@jupyter-widgets/controls, 1.1.0)
+### IntRangeSliderModel (@jupyter-widgets/controls, 1.2.0); IntRangeSliderView (@jupyter-widgets/controls, 1.2.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_dom_classes`   | array            | `[]`             | CSS classes applied to widget DOM element
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'IntRangeSliderModel'` | 
 `_view_module`   | string           | `'@jupyter-widgets/controls'` | 
-`_view_module_version` | string           | `'1.1.0'`        | 
+`_view_module_version` | string           | `'1.2.0'`        | 
 `_view_name`     | string           | `'IntRangeSliderView'` | 
 `continuous_update` | boolean          | `true`           | Update the value of the widget as the user is sliding the slider.
 `description`    | string           | `''`             | Description of the control.
@@ -518,16 +518,16 @@ Attribute        | Type             | Default          | Help
 `style`          | reference to SliderStyle widget | reference to new instance | Slider style customizations.
 `value`          | array            | `[0, 1]`         | Tuple of (lower, upper) bounds
 
-### IntSliderModel (@jupyter-widgets/controls, 1.1.0); IntSliderView (@jupyter-widgets/controls, 1.1.0)
+### IntSliderModel (@jupyter-widgets/controls, 1.2.0); IntSliderView (@jupyter-widgets/controls, 1.2.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_dom_classes`   | array            | `[]`             | CSS classes applied to widget DOM element
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'IntSliderModel'` | 
 `_view_module`   | string           | `'@jupyter-widgets/controls'` | 
-`_view_module_version` | string           | `'1.1.0'`        | 
+`_view_module_version` | string           | `'1.2.0'`        | 
 `_view_name`     | string           | `'IntSliderView'` | 
 `continuous_update` | boolean          | `true`           | Update the value of the widget as the user is holding the slider.
 `description`    | string           | `''`             | Description of the control.
@@ -542,16 +542,16 @@ Attribute        | Type             | Default          | Help
 `style`          | reference to SliderStyle widget | reference to new instance | 
 `value`          | number (integer) | `0`              | Int value
 
-### IntTextModel (@jupyter-widgets/controls, 1.1.0); IntTextView (@jupyter-widgets/controls, 1.1.0)
+### IntTextModel (@jupyter-widgets/controls, 1.2.0); IntTextView (@jupyter-widgets/controls, 1.2.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_dom_classes`   | array            | `[]`             | CSS classes applied to widget DOM element
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'IntTextModel'` | 
 `_view_module`   | string           | `'@jupyter-widgets/controls'` | 
-`_view_module_version` | string           | `'1.1.0'`        | 
+`_view_module_version` | string           | `'1.2.0'`        | 
 `_view_name`     | string           | `'IntTextView'`  | 
 `continuous_update` | boolean          | `false`          | Update the value as the user types. If False, update on submission, e.g., pressing Enter or navigating away.
 `description`    | string           | `''`             | Description of the control.
@@ -561,16 +561,16 @@ Attribute        | Type             | Default          | Help
 `style`          | reference to DescriptionStyle widget | reference to new instance | Styling customizations
 `value`          | number (integer) | `0`              | Int value
 
-### LabelModel (@jupyter-widgets/controls, 1.1.0); LabelView (@jupyter-widgets/controls, 1.1.0)
+### LabelModel (@jupyter-widgets/controls, 1.2.0); LabelView (@jupyter-widgets/controls, 1.2.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_dom_classes`   | array            | `[]`             | CSS classes applied to widget DOM element
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'LabelModel'`   | 
 `_view_module`   | string           | `'@jupyter-widgets/controls'` | 
-`_view_module_version` | string           | `'1.1.0'`        | 
+`_view_module_version` | string           | `'1.2.0'`        | 
 `_view_name`     | string           | `'LabelView'`    | 
 `description`    | string           | `''`             | Description of the control.
 `layout`         | reference to Layout widget | reference to new instance | 
@@ -578,29 +578,29 @@ Attribute        | Type             | Default          | Help
 `style`          | reference to DescriptionStyle widget | reference to new instance | Styling customizations
 `value`          | string           | `''`             | String value
 
-### LinkModel (@jupyter-widgets/controls, 1.1.0); None (@jupyter-widgets/controls, 1.1.0)
+### LinkModel (@jupyter-widgets/controls, 1.2.0); None (@jupyter-widgets/controls, 1.2.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'LinkModel'`    | 
 `_view_module`   | string           | `'@jupyter-widgets/controls'` | 
-`_view_module_version` | string           | `'1.1.0'`        | 
+`_view_module_version` | string           | `'1.2.0'`        | 
 `_view_name`     | `null` or string | `null`           | Name of the view.
 `source`         | array            | `[]`             | The source (widget, 'trait_name') pair
 `target`         | array            | `[]`             | The target (widget, 'trait_name') pair
 
-### PasswordModel (@jupyter-widgets/controls, 1.1.0); PasswordView (@jupyter-widgets/controls, 1.1.0)
+### PasswordModel (@jupyter-widgets/controls, 1.2.0); PasswordView (@jupyter-widgets/controls, 1.2.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_dom_classes`   | array            | `[]`             | CSS classes applied to widget DOM element
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'PasswordModel'` | 
 `_view_module`   | string           | `'@jupyter-widgets/controls'` | 
-`_view_module_version` | string           | `'1.1.0'`        | 
+`_view_module_version` | string           | `'1.2.0'`        | 
 `_view_name`     | string           | `'PasswordView'` | 
 `continuous_update` | boolean          | `true`           | Update the value as the user types. If False, update on submission, e.g., pressing Enter or navigating away.
 `description`    | string           | `''`             | Description of the control.
@@ -610,18 +610,18 @@ Attribute        | Type             | Default          | Help
 `style`          | reference to DescriptionStyle widget | reference to new instance | Styling customizations
 `value`          | string           | `''`             | String value
 
-### PlayModel (@jupyter-widgets/controls, 1.1.0); PlayView (@jupyter-widgets/controls, 1.1.0)
+### PlayModel (@jupyter-widgets/controls, 1.2.0); PlayView (@jupyter-widgets/controls, 1.2.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_dom_classes`   | array            | `[]`             | CSS classes applied to widget DOM element
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'PlayModel'`    | 
 `_playing`       | boolean          | `false`          | Whether the control is currently playing.
 `_repeat`        | boolean          | `false`          | Whether the control will repeat in a continous loop.
 `_view_module`   | string           | `'@jupyter-widgets/controls'` | 
-`_view_module_version` | string           | `'1.1.0'`        | 
+`_view_module_version` | string           | `'1.2.0'`        | 
 `_view_name`     | string           | `'PlayView'`     | 
 `description`    | string           | `''`             | Description of the control.
 `disabled`       | boolean          | `false`          | Enable or disable user changes
@@ -634,12 +634,12 @@ Attribute        | Type             | Default          | Help
 `style`          | reference to DescriptionStyle widget | reference to new instance | Styling customizations
 `value`          | number (integer) | `0`              | Int value
 
-### ProgressStyleModel (@jupyter-widgets/controls, 1.1.0); StyleView (@jupyter-widgets/base, 1.0.0)
+### ProgressStyleModel (@jupyter-widgets/controls, 1.2.0); StyleView (@jupyter-widgets/base, 1.0.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'ProgressStyleModel'` | 
 `_view_module`   | string           | `'@jupyter-widgets/base'` | 
 `_view_module_version` | string           | `'1.0.0'`        | 
@@ -647,17 +647,17 @@ Attribute        | Type             | Default          | Help
 `bar_color`      | `null` or string | `null`           | Color of the progress bar.
 `description_width` | string           | `''`             | Width of the description to the side of the control.
 
-### RadioButtonsModel (@jupyter-widgets/controls, 1.1.0); RadioButtonsView (@jupyter-widgets/controls, 1.1.0)
+### RadioButtonsModel (@jupyter-widgets/controls, 1.2.0); RadioButtonsView (@jupyter-widgets/controls, 1.2.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_dom_classes`   | array            | `[]`             | CSS classes applied to widget DOM element
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'RadioButtonsModel'` | 
 `_options_labels` | array            | `[]`             | The labels for the options.
 `_view_module`   | string           | `'@jupyter-widgets/controls'` | 
-`_view_module_version` | string           | `'1.1.0'`        | 
+`_view_module_version` | string           | `'1.2.0'`        | 
 `_view_name`     | string           | `'RadioButtonsView'` | 
 `description`    | string           | `''`             | Description of the control.
 `disabled`       | boolean          | `false`          | Enable or disable user changes
@@ -665,17 +665,17 @@ Attribute        | Type             | Default          | Help
 `layout`         | reference to Layout widget | reference to new instance | 
 `style`          | reference to DescriptionStyle widget | reference to new instance | Styling customizations
 
-### SelectModel (@jupyter-widgets/controls, 1.1.0); SelectView (@jupyter-widgets/controls, 1.1.0)
+### SelectModel (@jupyter-widgets/controls, 1.2.0); SelectView (@jupyter-widgets/controls, 1.2.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_dom_classes`   | array            | `[]`             | CSS classes applied to widget DOM element
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'SelectModel'`  | 
 `_options_labels` | array            | `[]`             | The labels for the options.
 `_view_module`   | string           | `'@jupyter-widgets/controls'` | 
-`_view_module_version` | string           | `'1.1.0'`        | 
+`_view_module_version` | string           | `'1.2.0'`        | 
 `_view_name`     | string           | `'SelectView'`   | 
 `description`    | string           | `''`             | Description of the control.
 `disabled`       | boolean          | `false`          | Enable or disable user changes
@@ -684,17 +684,17 @@ Attribute        | Type             | Default          | Help
 `rows`           | number (integer) | `5`              | The number of rows to display.
 `style`          | reference to DescriptionStyle widget | reference to new instance | Styling customizations
 
-### SelectMultipleModel (@jupyter-widgets/controls, 1.1.0); SelectMultipleView (@jupyter-widgets/controls, 1.1.0)
+### SelectMultipleModel (@jupyter-widgets/controls, 1.2.0); SelectMultipleView (@jupyter-widgets/controls, 1.2.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_dom_classes`   | array            | `[]`             | CSS classes applied to widget DOM element
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'SelectMultipleModel'` | 
 `_options_labels` | array            | `[]`             | The labels for the options.
 `_view_module`   | string           | `'@jupyter-widgets/controls'` | 
-`_view_module_version` | string           | `'1.1.0'`        | 
+`_view_module_version` | string           | `'1.2.0'`        | 
 `_view_name`     | string           | `'SelectMultipleView'` | 
 `description`    | string           | `''`             | Description of the control.
 `disabled`       | boolean          | `false`          | Enable or disable user changes
@@ -703,17 +703,17 @@ Attribute        | Type             | Default          | Help
 `rows`           | number (integer) | `5`              | The number of rows to display.
 `style`          | reference to DescriptionStyle widget | reference to new instance | Styling customizations
 
-### SelectionRangeSliderModel (@jupyter-widgets/controls, 1.1.0); SelectionRangeSliderView (@jupyter-widgets/controls, 1.1.0)
+### SelectionRangeSliderModel (@jupyter-widgets/controls, 1.2.0); SelectionRangeSliderView (@jupyter-widgets/controls, 1.2.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_dom_classes`   | array            | `[]`             | CSS classes applied to widget DOM element
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'SelectionRangeSliderModel'` | 
 `_options_labels` | array            | `[]`             | The labels for the options.
 `_view_module`   | string           | `'@jupyter-widgets/controls'` | 
-`_view_module_version` | string           | `'1.1.0'`        | 
+`_view_module_version` | string           | `'1.2.0'`        | 
 `_view_name`     | string           | `'SelectionRangeSliderView'` | 
 `continuous_update` | boolean          | `true`           | Update the value of the widget as the user is holding the slider.
 `description`    | string           | `''`             | Description of the control.
@@ -724,17 +724,17 @@ Attribute        | Type             | Default          | Help
 `readout`        | boolean          | `true`           | Display the current selected label next to the slider
 `style`          | reference to DescriptionStyle widget | reference to new instance | Styling customizations
 
-### SelectionSliderModel (@jupyter-widgets/controls, 1.1.0); SelectionSliderView (@jupyter-widgets/controls, 1.1.0)
+### SelectionSliderModel (@jupyter-widgets/controls, 1.2.0); SelectionSliderView (@jupyter-widgets/controls, 1.2.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_dom_classes`   | array            | `[]`             | CSS classes applied to widget DOM element
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'SelectionSliderModel'` | 
 `_options_labels` | array            | `[]`             | The labels for the options.
 `_view_module`   | string           | `'@jupyter-widgets/controls'` | 
-`_view_module_version` | string           | `'1.1.0'`        | 
+`_view_module_version` | string           | `'1.2.0'`        | 
 `_view_name`     | string           | `'SelectionSliderView'` | 
 `continuous_update` | boolean          | `true`           | Update the value of the widget as the user is holding the slider.
 `description`    | string           | `''`             | Description of the control.
@@ -745,12 +745,12 @@ Attribute        | Type             | Default          | Help
 `readout`        | boolean          | `true`           | Display the current selected label next to the slider
 `style`          | reference to DescriptionStyle widget | reference to new instance | Styling customizations
 
-### SliderStyleModel (@jupyter-widgets/controls, 1.1.0); StyleView (@jupyter-widgets/base, 1.0.0)
+### SliderStyleModel (@jupyter-widgets/controls, 1.2.0); StyleView (@jupyter-widgets/base, 1.0.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'SliderStyleModel'` | 
 `_view_module`   | string           | `'@jupyter-widgets/base'` | 
 `_view_module_version` | string           | `'1.0.0'`        | 
@@ -758,33 +758,33 @@ Attribute        | Type             | Default          | Help
 `description_width` | string           | `''`             | Width of the description to the side of the control.
 `handle_color`   | `null` or string | `null`           | Color of the slider handle.
 
-### TabModel (@jupyter-widgets/controls, 1.1.0); TabView (@jupyter-widgets/controls, 1.1.0)
+### TabModel (@jupyter-widgets/controls, 1.2.0); TabView (@jupyter-widgets/controls, 1.2.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_dom_classes`   | array            | `[]`             | CSS classes applied to widget DOM element
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'TabModel'`     | 
 `_titles`        | object           | `{}`             | Titles of the pages
 `_view_module`   | string           | `'@jupyter-widgets/controls'` | 
-`_view_module_version` | string           | `'1.1.0'`        | 
+`_view_module_version` | string           | `'1.2.0'`        | 
 `_view_name`     | string           | `'TabView'`      | 
 `box_style`      | string (one of `'success'`, `'info'`, `'warning'`, `'danger'`, `''`) | `''`             | Use a predefined styling for the box.
 `children`       | array            | `[]`             | List of widget children
 `layout`         | reference to Layout widget | reference to new instance | 
 `selected_index` | `null` or number (integer) | `0`              | The index of the selected page. This is either an integer selecting a particular sub-widget, or None to have no widgets selected.
 
-### TextModel (@jupyter-widgets/controls, 1.1.0); TextView (@jupyter-widgets/controls, 1.1.0)
+### TextModel (@jupyter-widgets/controls, 1.2.0); TextView (@jupyter-widgets/controls, 1.2.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_dom_classes`   | array            | `[]`             | CSS classes applied to widget DOM element
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'TextModel'`    | 
 `_view_module`   | string           | `'@jupyter-widgets/controls'` | 
-`_view_module_version` | string           | `'1.1.0'`        | 
+`_view_module_version` | string           | `'1.2.0'`        | 
 `_view_name`     | string           | `'TextView'`     | 
 `continuous_update` | boolean          | `true`           | Update the value as the user types. If False, update on submission, e.g., pressing Enter or navigating away.
 `description`    | string           | `''`             | Description of the control.
@@ -794,16 +794,16 @@ Attribute        | Type             | Default          | Help
 `style`          | reference to DescriptionStyle widget | reference to new instance | Styling customizations
 `value`          | string           | `''`             | String value
 
-### TextareaModel (@jupyter-widgets/controls, 1.1.0); TextareaView (@jupyter-widgets/controls, 1.1.0)
+### TextareaModel (@jupyter-widgets/controls, 1.2.0); TextareaView (@jupyter-widgets/controls, 1.2.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_dom_classes`   | array            | `[]`             | CSS classes applied to widget DOM element
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'TextareaModel'` | 
 `_view_module`   | string           | `'@jupyter-widgets/controls'` | 
-`_view_module_version` | string           | `'1.1.0'`        | 
+`_view_module_version` | string           | `'1.2.0'`        | 
 `_view_name`     | string           | `'TextareaView'` | 
 `continuous_update` | boolean          | `true`           | Update the value as the user types. If False, update on submission, e.g., pressing Enter or navigating away.
 `description`    | string           | `''`             | Description of the control.
@@ -814,16 +814,16 @@ Attribute        | Type             | Default          | Help
 `style`          | reference to DescriptionStyle widget | reference to new instance | Styling customizations
 `value`          | string           | `''`             | String value
 
-### ToggleButtonModel (@jupyter-widgets/controls, 1.1.0); ToggleButtonView (@jupyter-widgets/controls, 1.1.0)
+### ToggleButtonModel (@jupyter-widgets/controls, 1.2.0); ToggleButtonView (@jupyter-widgets/controls, 1.2.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_dom_classes`   | array            | `[]`             | CSS classes applied to widget DOM element
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'ToggleButtonModel'` | 
 `_view_module`   | string           | `'@jupyter-widgets/controls'` | 
-`_view_module_version` | string           | `'1.1.0'`        | 
+`_view_module_version` | string           | `'1.2.0'`        | 
 `_view_name`     | string           | `'ToggleButtonView'` | 
 `button_style`   | string (one of `'primary'`, `'success'`, `'info'`, `'warning'`, `'danger'`, `''`) | `''`             | Use a predefined styling for the button.
 `description`    | string           | `''`             | Description of the control.
@@ -834,17 +834,17 @@ Attribute        | Type             | Default          | Help
 `tooltip`        | string           | `''`             | Tooltip caption of the toggle button.
 `value`          | boolean          | `false`          | Bool value
 
-### ToggleButtonsModel (@jupyter-widgets/controls, 1.1.0); ToggleButtonsView (@jupyter-widgets/controls, 1.1.0)
+### ToggleButtonsModel (@jupyter-widgets/controls, 1.2.0); ToggleButtonsView (@jupyter-widgets/controls, 1.2.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_dom_classes`   | array            | `[]`             | CSS classes applied to widget DOM element
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'ToggleButtonsModel'` | 
 `_options_labels` | array            | `[]`             | The labels for the options.
 `_view_module`   | string           | `'@jupyter-widgets/controls'` | 
-`_view_module_version` | string           | `'1.1.0'`        | 
+`_view_module_version` | string           | `'1.2.0'`        | 
 `_view_name`     | string           | `'ToggleButtonsView'` | 
 `button_style`   | `null` or string (one of `'primary'`, `'success'`, `'info'`, `'warning'`, `'danger'`, `''`) | `''`             | Use a predefined styling for the buttons.
 `description`    | string           | `''`             | Description of the control.
@@ -855,12 +855,12 @@ Attribute        | Type             | Default          | Help
 `style`          | reference to ToggleButtonsStyle widget | reference to new instance | 
 `tooltips`       | array            | `[]`             | Tooltips for each button.
 
-### ToggleButtonsStyleModel (@jupyter-widgets/controls, 1.1.0); StyleView (@jupyter-widgets/base, 1.0.0)
+### ToggleButtonsStyleModel (@jupyter-widgets/controls, 1.2.0); StyleView (@jupyter-widgets/base, 1.0.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'ToggleButtonsStyleModel'` | 
 `_view_module`   | string           | `'@jupyter-widgets/base'` | 
 `_view_module_version` | string           | `'1.0.0'`        | 
@@ -869,31 +869,31 @@ Attribute        | Type             | Default          | Help
 `description_width` | string           | `''`             | Width of the description to the side of the control.
 `font_weight`    | string           | `''`             | Text font weight of each button.
 
-### VBoxModel (@jupyter-widgets/controls, 1.1.0); VBoxView (@jupyter-widgets/controls, 1.1.0)
+### VBoxModel (@jupyter-widgets/controls, 1.2.0); VBoxView (@jupyter-widgets/controls, 1.2.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_dom_classes`   | array            | `[]`             | CSS classes applied to widget DOM element
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'VBoxModel'`    | 
 `_view_module`   | string           | `'@jupyter-widgets/controls'` | 
-`_view_module_version` | string           | `'1.1.0'`        | 
+`_view_module_version` | string           | `'1.2.0'`        | 
 `_view_name`     | string           | `'VBoxView'`     | 
 `box_style`      | string (one of `'success'`, `'info'`, `'warning'`, `'danger'`, `''`) | `''`             | Use a predefined styling for the box.
 `children`       | array            | `[]`             | List of widget children
 `layout`         | reference to Layout widget | reference to new instance | 
 
-### ValidModel (@jupyter-widgets/controls, 1.1.0); ValidView (@jupyter-widgets/controls, 1.1.0)
+### ValidModel (@jupyter-widgets/controls, 1.2.0); ValidView (@jupyter-widgets/controls, 1.2.0)
 
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_dom_classes`   | array            | `[]`             | CSS classes applied to widget DOM element
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
-`_model_module_version` | string           | `'1.1.0'`        | 
+`_model_module_version` | string           | `'1.2.0'`        | 
 `_model_name`    | string           | `'ValidModel'`   | 
 `_view_module`   | string           | `'@jupyter-widgets/controls'` | 
-`_view_module_version` | string           | `'1.1.0'`        | 
+`_view_module_version` | string           | `'1.2.0'`        | 
 `_view_name`     | string           | `'ValidView'`    | 
 `description`    | string           | `''`             | Description of the control.
 `disabled`       | boolean          | `false`          | Enable or disable user changes.