CustomElementRegistry: upgrade() method
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
js
upgrade(root)
Parameters
Return value
None (undefined
).
Examples
Taken from the HTML spec:
js
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 |
---|
HTML Standard # dom-customelementregistry-upgrade-dev |
Browser compatibility
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