Comment by err4nt

I wish it didn't require authors to practice doing the wrong thing (writing invalid HTML) for to use the tool.

Authors are free to either create any data-* attributes they wish for any purpose, so long as the custom attributes are prefixed with "data-".

Authors are also free to create any (valid) HTML custom element, and to invent custom attributes for those elements.

But this appears to require authors to write invalid HTML.