https://developer.mozilla.org/de/docs/Web/API/CustomElementRegistry/upgrade
CustomElementRegistry: upgrade() Methode - Web-APIs | MDN
Die upgrade() Methode der CustomElementRegistry-Schnittstelle aktualisiert alle schattenhaltigen benutzerdefinierten Elemente in einem Node-Unterbaum, selbst...
web apisupgrademethodemdn
https://developer.mozilla.org/en-US/docs/Web/API/CustomElementRegistry/upgrade
CustomElementRegistry: upgrade() method - Web APIs | MDN
The upgrade() method of the CustomElementRegistry interface upgrades all shadow-containing custom elements in a Node subtree, even before they are connected to...
web apisupgrademethodmdn