diff --git a/docs/pages/api/snackbar.md b/docs/pages/api/snackbar.md
index 095602ee0399e6..872413236b8062 100644
--- a/docs/pages/api/snackbar.md
+++ b/docs/pages/api/snackbar.md
@@ -26,7 +26,7 @@ You can learn more about the difference by [reading this guide](/guides/minimizi
 |:-----|:-----|:--------|:------------|
 | <span class="prop-name">action</span> | <span class="prop-type">node</span> |  | The action to display. It renders after the message, at the end of the snackbar. |
 | <span class="prop-name">anchorOrigin</span> | <span class="prop-type">{ horizontal: 'left'<br>&#124;&nbsp;'center'<br>&#124;&nbsp;'right', vertical: 'top'<br>&#124;&nbsp;'bottom' }</span> | <span class="prop-default">{ vertical: 'bottom', horizontal: 'center' }</span> | The anchor of the `Snackbar`. |
-| <span class="prop-name">autoHideDuration</span> | <span class="prop-type">number</span> |  | The number of milliseconds to wait before automatically calling the `onClose` function. `onClose` should then set the state of the `open` prop to hide the Snackbar. This behavior is disabled by default with the `null` value. |
+| <span class="prop-name">autoHideDuration</span> | <span class="prop-type">number</span> | <span class="prop-default">null</span> | The number of milliseconds to wait before automatically calling the `onClose` function. `onClose` should then set the state of the `open` prop to hide the Snackbar. This behavior is disabled by default with the `null` value. |
 | <span class="prop-name">children</span> | <span class="prop-type">element</span> |  | Replace the `SnackbarContent` component. |
 | <span class="prop-name">classes</span> | <span class="prop-type">object</span> |  | Override or extend the styles applied to the component. See [CSS API](#css) below for more details. |
 | <span class="prop-name">ClickAwayListenerProps</span> | <span class="prop-type">object</span> |  | Props applied to the `ClickAwayListener` element. |
diff --git a/docs/src/pages/components/snackbars/ConsecutiveSnackbars.js b/docs/src/pages/components/snackbars/ConsecutiveSnackbars.js
index 637aa8e099a932..02493c6e2954d8 100644
--- a/docs/src/pages/components/snackbars/ConsecutiveSnackbars.js
+++ b/docs/src/pages/components/snackbars/ConsecutiveSnackbars.js
@@ -64,10 +64,7 @@ export default function ConsecutiveSnackbars() {
         autoHideDuration={6000}
         onClose={handleClose}
         onExited={handleExited}
-        ContentProps={{
-          'aria-describedby': 'message-id',
-        }}
-        message={<span id="message-id">{messageInfo ? messageInfo.message : undefined}</span>}
+        message={messageInfo ? messageInfo.message : undefined}
         action={
           <React.Fragment>
             <Button color="secondary" size="small" onClick={handleClose}>
diff --git a/docs/src/pages/components/snackbars/ConsecutiveSnackbars.tsx b/docs/src/pages/components/snackbars/ConsecutiveSnackbars.tsx
index 383f3e98a9cba5..cb5989c0c01d93 100644
--- a/docs/src/pages/components/snackbars/ConsecutiveSnackbars.tsx
+++ b/docs/src/pages/components/snackbars/ConsecutiveSnackbars.tsx
@@ -76,10 +76,7 @@ export default function ConsecutiveSnackbars() {
         autoHideDuration={6000}
         onClose={handleClose}
         onExited={handleExited}
-        ContentProps={{
-          'aria-describedby': 'message-id',
-        }}
-        message={<span id="message-id">{messageInfo ? messageInfo.message : undefined}</span>}
+        message={messageInfo ? messageInfo.message : undefined}
         action={
           <React.Fragment>
             <Button color="secondary" size="small" onClick={handleClose}>
diff --git a/docs/src/pages/components/snackbars/DirectionSnackbar.js b/docs/src/pages/components/snackbars/DirectionSnackbar.js
index 224fd3e078b0e7..8ab7521044e474 100644
--- a/docs/src/pages/components/snackbars/DirectionSnackbar.js
+++ b/docs/src/pages/components/snackbars/DirectionSnackbar.js
@@ -42,10 +42,7 @@ export default function DirectionSnackbar() {
         open={open}
         onClose={handleClose}
         TransitionComponent={transition}
-        ContentProps={{
-          'aria-describedby': 'message-id',
-        }}
-        message={<span id="message-id">I love snacks</span>}
+        message="I love snacks"
       />
     </div>
   );
diff --git a/docs/src/pages/components/snackbars/DirectionSnackbar.tsx b/docs/src/pages/components/snackbars/DirectionSnackbar.tsx
index 5718a08c7ddd6f..d94b75acf8a030 100644
--- a/docs/src/pages/components/snackbars/DirectionSnackbar.tsx
+++ b/docs/src/pages/components/snackbars/DirectionSnackbar.tsx
@@ -45,10 +45,7 @@ export default function DirectionSnackbar() {
         open={open}
         onClose={handleClose}
         TransitionComponent={transition}
-        ContentProps={{
-          'aria-describedby': 'message-id',
-        }}
-        message={<span id="message-id">I love snacks</span>}
+        message="I love snacks"
       />
     </div>
   );
diff --git a/docs/src/pages/components/snackbars/FabIntegrationSnackbar.js b/docs/src/pages/components/snackbars/FabIntegrationSnackbar.js
index bf85a1cfb61eed..0086764fc4391b 100644
--- a/docs/src/pages/components/snackbars/FabIntegrationSnackbar.js
+++ b/docs/src/pages/components/snackbars/FabIntegrationSnackbar.js
@@ -59,11 +59,8 @@ export default function FabIntegrationSnackbar() {
         </Fab>
         <Snackbar
           open
-          autoHideDuration={4000}
-          ContentProps={{
-            'aria-describedby': 'snackbar-fab-message-id',
-          }}
-          message={<span id="snackbar-fab-message-id">Archived</span>}
+          autoHideDuration={6000}
+          message="Archived"
           action={
             <Button color="inherit" size="small">
               Undo
diff --git a/docs/src/pages/components/snackbars/FabIntegrationSnackbar.tsx b/docs/src/pages/components/snackbars/FabIntegrationSnackbar.tsx
index cc128b7b610ae4..12a144613a8209 100644
--- a/docs/src/pages/components/snackbars/FabIntegrationSnackbar.tsx
+++ b/docs/src/pages/components/snackbars/FabIntegrationSnackbar.tsx
@@ -61,11 +61,8 @@ export default function FabIntegrationSnackbar() {
         </Fab>
         <Snackbar
           open
-          autoHideDuration={4000}
-          ContentProps={{
-            'aria-describedby': 'snackbar-fab-message-id',
-          }}
-          message={<span id="snackbar-fab-message-id">Archived</span>}
+          autoHideDuration={6000}
+          message="Archived"
           action={
             <Button color="inherit" size="small">
               Undo
diff --git a/docs/src/pages/components/snackbars/PositionedSnackbar.js b/docs/src/pages/components/snackbars/PositionedSnackbar.js
index c9f62c104fc083..8e41c53f9fcce7 100644
--- a/docs/src/pages/components/snackbars/PositionedSnackbar.js
+++ b/docs/src/pages/components/snackbars/PositionedSnackbar.js
@@ -36,10 +36,7 @@ export default function PositionedSnackbar() {
         key={`${vertical},${horizontal}`}
         open={open}
         onClose={handleClose}
-        ContentProps={{
-          'aria-describedby': 'message-id',
-        }}
-        message={<span id="message-id">I love snacks</span>}
+        message="I love snacks"
       />
     </div>
   );
diff --git a/docs/src/pages/components/snackbars/PositionedSnackbar.tsx b/docs/src/pages/components/snackbars/PositionedSnackbar.tsx
index b29f5b86ed312e..c57a1df6d02d16 100644
--- a/docs/src/pages/components/snackbars/PositionedSnackbar.tsx
+++ b/docs/src/pages/components/snackbars/PositionedSnackbar.tsx
@@ -39,10 +39,7 @@ export default function PositionedSnackbar() {
         key={`${vertical},${horizontal}`}
         open={open}
         onClose={handleClose}
-        ContentProps={{
-          'aria-describedby': 'message-id',
-        }}
-        message={<span id="message-id">I love snacks</span>}
+        message="I love snacks"
       />
     </div>
   );
diff --git a/docs/src/pages/components/snackbars/SimpleSnackbar.js b/docs/src/pages/components/snackbars/SimpleSnackbar.js
index a696edfb083fdd..a4f5f1ff3aa7db 100644
--- a/docs/src/pages/components/snackbars/SimpleSnackbar.js
+++ b/docs/src/pages/components/snackbars/SimpleSnackbar.js
@@ -30,10 +30,7 @@ export default function SimpleSnackbar() {
         open={open}
         autoHideDuration={6000}
         onClose={handleClose}
-        ContentProps={{
-          'aria-describedby': 'message-id',
-        }}
-        message={<span id="message-id">Note archived</span>}
+        message="Note archived"
         action={
           <React.Fragment>
             <Button color="secondary" size="small" onClick={handleClose}>
diff --git a/docs/src/pages/components/snackbars/SimpleSnackbar.tsx b/docs/src/pages/components/snackbars/SimpleSnackbar.tsx
index 8af26e04d7e1e6..e3a365d4e685dc 100644
--- a/docs/src/pages/components/snackbars/SimpleSnackbar.tsx
+++ b/docs/src/pages/components/snackbars/SimpleSnackbar.tsx
@@ -30,10 +30,7 @@ export default function SimpleSnackbar() {
         open={open}
         autoHideDuration={6000}
         onClose={handleClose}
-        ContentProps={{
-          'aria-describedby': 'message-id',
-        }}
-        message={<span id="message-id">Note archived</span>}
+        message="Note archived"
         action={
           <React.Fragment>
             <Button color="secondary" size="small" onClick={handleClose}>
diff --git a/docs/src/pages/components/snackbars/TransitionsSnackbar.js b/docs/src/pages/components/snackbars/TransitionsSnackbar.js
index c302782d6bffc9..cb366a58166538 100644
--- a/docs/src/pages/components/snackbars/TransitionsSnackbar.js
+++ b/docs/src/pages/components/snackbars/TransitionsSnackbar.js
@@ -42,10 +42,7 @@ export default function TransitionsSnackbar() {
         open={state.open}
         onClose={handleClose}
         TransitionComponent={state.Transition}
-        ContentProps={{
-          'aria-describedby': 'message-id',
-        }}
-        message={<span id="message-id">I love snacks</span>}
+        message="I love snacks"
       />
     </div>
   );
diff --git a/docs/src/pages/components/snackbars/TransitionsSnackbar.tsx b/docs/src/pages/components/snackbars/TransitionsSnackbar.tsx
index b0eccfe76db659..3826a3b6bc7216 100644
--- a/docs/src/pages/components/snackbars/TransitionsSnackbar.tsx
+++ b/docs/src/pages/components/snackbars/TransitionsSnackbar.tsx
@@ -43,10 +43,7 @@ export default function TransitionsSnackbar() {
         open={state.open}
         onClose={handleClose}
         TransitionComponent={state.Transition}
-        ContentProps={{
-          'aria-describedby': 'message-id',
-        }}
-        message={<span id="message-id">I love snacks</span>}
+        message="I love snacks"
       />
     </div>
   );
diff --git a/docs/src/pages/components/snackbars/snackbars.md b/docs/src/pages/components/snackbars/snackbars.md
index 385e759a6dd3d1..01ad963b46d782 100644
--- a/docs/src/pages/components/snackbars/snackbars.md
+++ b/docs/src/pages/components/snackbars/snackbars.md
@@ -53,7 +53,7 @@ When multiple snackbar updates are necessary, they should appear one at a time.
 
 Snackbars should appear above FABs (on mobile).
 
-{{"demo": "pages/components/snackbars/FabIntegrationSnackbar.js", "iframe": true, "maxWidth": 500}}
+{{"demo": "pages/components/snackbars/FabIntegrationSnackbar.js", "iframe": true, "maxWidth": 400}}
 
 ### Change Transition
 
@@ -86,27 +86,4 @@ It also enables you to **stack** them on top of one another (although this is di
 
 (WAI-ARIA: https://www.w3.org/TR/wai-aria-1.1/#alert)
 
-- Since alerts are not required to receive focus, content authors should not require users to close a Snackbar if the role is set to `alert` through the SnackbarContent `role` prop. This is the default role.
-- If a Snackbar requires focus to close it, then content authors should use the `role` of `alertdialog`.
-
-```jsx
-<SnackbarContent
-  message="This is a Snackbar message."
-  role="alert"
-/>
-```
-
-```jsx
-<Snackbar
-  ContentProps={{
-    'aria-describedby': 'snackbar-fab-message-id',
-    'role': 'alertdialog',
-  }}
-  message={<span id="snackbar-fab-message-id">Archived</span>}
-  action={
-    <Button color="inherit" size="small">
-      Undo
-    </Button>
-  }
-/>
-```
+- By default, the snackbar won't auto-hide. However, if you decide to use the `autoHideDuration` prop, it's recommended to give the user [sufficient time](https://www.w3.org/TR/UNDERSTANDING-WCAG20/time-limits.html) to respond.
diff --git a/docs/src/pages/premium-themes/onepirate/modules/components/Snackbar.js b/docs/src/pages/premium-themes/onepirate/modules/components/Snackbar.js
index c2a20ec476137c..2b27d57d774089 100644
--- a/docs/src/pages/premium-themes/onepirate/modules/components/Snackbar.js
+++ b/docs/src/pages/premium-themes/onepirate/modules/components/Snackbar.js
@@ -46,10 +46,9 @@ function Snackbar(props) {
   return (
     <MuiSnackbar
       anchorOrigin={{ vertical: 'top', horizontal: 'center' }}
-      autoHideDuration={6e3}
+      autoHideDuration={6000}
       transition={Transition}
       ContentProps={{
-        'aria-describedby': 'snackbar',
         classes: {
           root: classes.content,
           message: classes.contentMessage,
@@ -59,7 +58,7 @@ function Snackbar(props) {
       message={
         <React.Fragment>
           <InfoIcon className={classes.info} />
-          <span id="snackbar">{message}</span>
+          <span>{message}</span>
         </React.Fragment>
       }
       action={[
diff --git a/packages/material-ui/src/Snackbar/Snackbar.js b/packages/material-ui/src/Snackbar/Snackbar.js
index a5608e1cef252f..275be180eaa94e 100644
--- a/packages/material-ui/src/Snackbar/Snackbar.js
+++ b/packages/material-ui/src/Snackbar/Snackbar.js
@@ -99,7 +99,7 @@ const Snackbar = React.forwardRef(function Snackbar(props, ref) {
   const {
     action,
     anchorOrigin: { vertical, horizontal } = { vertical: 'bottom', horizontal: 'center' },
-    autoHideDuration,
+    autoHideDuration = null,
     children,
     classes,
     className,
diff --git a/packages/material-ui/test/typescript/components.spec.tsx b/packages/material-ui/test/typescript/components.spec.tsx
index 5b8bd0bc522d45..91f6b2ee98f2dc 100644
--- a/packages/material-ui/test/typescript/components.spec.tsx
+++ b/packages/material-ui/test/typescript/components.spec.tsx
@@ -716,7 +716,7 @@ const SnackbarTest = () => (
         horizontal: 'left',
       }}
       open={true}
-      autoHideDuration={6e3}
+      autoHideDuration={6000}
       onClose={e => log(e)}
       ContentProps={
         {