Add support for <ol reversed>, related attributes #396
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<ol reversed>
as a boolean attribute so it serializes properly in HTML.<ol reversed>
in the sanitizer. Closes Sanitizer removes the <ol> "reversed" attribute #321.<ol start>
in the sanitizer.<ol type>
was already allowed, but probably accidentally (type is an attribute allowed for other tags). I added a test to prevent it from regressing in case we add per-element attribute sanitization in the future.https://html.spec.whatwg.org/multipage/grouping-content.html#attr-ol-reversed