### What is the issue with the HTML Standard? ["Upgrade particular elements within a document"](https://html.spec.whatwg.org/multipage/custom-elements.html#upgrade-particular-elements-within-a-document), step 2, uses a variable named `definition`: > For each element element of upgradeCandidates: [enqueue a custom element upgrade reaction](https://html.spec.whatwg.org/multipage/custom-elements.html#enqueue-a-custom-element-upgrade-reaction) given element and definition. However, there isn't a variable named `definition` in scope. Looks like there used to be when this step was part of the [`define()`](https://html.spec.whatwg.org/multipage/custom-elements.html#dom-customelementregistry-define) method steps. I'm guessing it just needs passing in to the "upgrade particular elements..." algorithm. @annevk