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The entire second half of the article acts as if custom elements aren't already supported in HTML:

https://html.spec.whatwg.org/multipage/custom-elements.html

You can go ahead and create <whatever> <custom-elements> with whatever attributes you want and it'll work.

Custom elements are supported, but custom attributes on existing elements are not—an asymmetry that the WHATWG proposal I linked to makes note of.

This is a helpful and concise explanation. As I read the article, I continually wondered when custom elements would appear, and was surprised that they didn't. Adding this context around the link you mention would help.

(I didn't click on the link because I was focused on absorbing your article in one go; now that I've looked at the link, I think that your sentence is much more concise for the reader.)

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