Baseline Widely available
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.
root
A Node instance with shadow-containing descendant elements to upgrade. If there are no descendant elements that can be upgraded, no error is thrown.
None (undefined).
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!
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HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.3