feat(standards): add html-elms spec

[straker]

Continued from #2325 to get a clean tree instead of a botched file merge of 34 file changes.

This table replaces some hardcoded values in our code and allows us to work on #1597 and #601 by allowing us to identify interactive content.

Replaces these values:

• phrasingElements in subtree-text
• htmlTags in is-html-element (which is why there are empty objects)
• possibleShadowRoots in is-shadow-root.js
• part of the sectioningElementSelector in lookup-table.js
• all of native-element-type.js

This will also allow us to replace svg-namespace-matches and html-namespace-matches with this table by looking up the element name in the table to get us 90% of the way there. Two elements such as a and svg belong to both tables, so we will have a special case for those.

There might be a few more but those were the ones I could find in a quick element search.

Just like we plan to do for the aria-attributes spec, we should create a commons helper that aggregates information from this table into useful forms, such as getting all elements that are of a certain content type.

Reviewer checks

Required fields, to be filled out by PR reviewer(s)

• Follows the commit message policy, appropriate for next version
• Code is reviewed for security

Resolved

Resolved

[WilcoFiers]

Couple more small points.

Resolved