The is
global attribute allows you to specify that a standard HTML element should behave like a defined custom built-in element (see Using custom elements for more details).
This attribute can only be used if the specified custom element name has been successfully defined in the current document, and extends the element type it is being applied to.
Examples
The following code is taken from our word-count-web-component example (see it live also).
// Create a class for the element class WordCount extends HTMLParagraphElement { constructor() { // Always call super first in constructor super(); // Constructor contents ommitted for brevity ... } } // Define the new element customElements.define('word-count', WordCount, { extends: 'p' });
<p is="word-count"></p>
Specifications
Specification | Status | Comment |
---|---|---|
HTML Living Standard The definition of 'is' in that specification. |
Living Standard |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
is | Chrome Full support 67 | Edge Full support 79 | Firefox
Full support
63
| IE No support No | Opera Full support 55 | Safari No support No | WebView Android Full support 67 | Chrome Android Full support 67 | Firefox Android
Full support
63
| Opera Android Full support 48 | Safari iOS No support No | Samsung Internet Android Full support 9.0 |
Legend
- Full support
- Full support
- No support
- No support
- User must explicitly enable this feature.
- User must explicitly enable this feature.
See also
- All global attributes.