The upgrade()
method of the CustomElementRegistry
interface upgrades all shadow-containing custom elements in a Node
subtree, even before they are connected to the main document.
Syntax
customElements.upgrade(root);
Parameters
root
- A
Node
instance with shadow-containing descendant elements that are to be upgraded. If there are no descendant elements that can be upgraded, no error is thrown.
Return value
Void.
Examples
Taken from the HTML spec:
const el = document.createElement("spider-man"); class SpiderMan extends HTMLElement {} customElements.define("spider-man", SpiderMan); console.assert(!(el instanceof SpiderMan)); // not yet upgraded customElements.upgrade(el); console.assert(el instanceof SpiderMan); // upgraded!
Specifications
Specification | Status | Comment |
---|---|---|
HTML Living Standard The definition of 'customElements.upgrade()' in that specification. |
Living Standard | Initial definition. |
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 | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
upgrade | Chrome Full support 68 | Edge Full support 79 | Firefox Full support 63 | IE No support No | Opera Full support 55 | Safari ? | WebView Android Full support 68 | Chrome Android Full support 68 | Firefox Android Full support 63 | Opera Android Full support 48 | Safari iOS ? | Samsung Internet Android Full support 10.0 |
Legend
- Full support
- Full support
- No support
- No support
- Compatibility unknown
- Compatibility unknown
- Experimental. Expect behavior to change in the future.
- Experimental. Expect behavior to change in the future.