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Custom elements updates, first cut. #2540
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arthurevans
commented
Apr 27, 2018
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| ``` | ||
| my-element:not(:defined) { | ||
| background-color: blue; | ||
| } | ||
| ``` | ||
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| **`:defined` is not supported by the Custom Elements polyfill.** See the [documentation on styling](style-shadow-dom#style-undefined-elements) for a workaround. |
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ghost
reviewed
Apr 28, 2018
| // Create a class that extends HTMLElement (directly or indirectly) | ||
| class MyElement extends HTMLElement { … }; | ||
| ```js | ||
| import {PolymerElement} from '@polymer/polymer/polymer-element.js`; |
ghost
reviewed
Apr 28, 2018
| ``` | ||
| ```js | ||
| // Import PolymerElement class | ||
| import {PolymerElement} from '@polymer/polymer/polymer-element.js`; |
ghost
approved these changes
Apr 28, 2018
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