Support <abbr>, <kbd>, <q>, and all ruby tags
See this post in ~test.
All of these text elements have a clear semantic and functional purpose. They don't add any interactivity, so allowing them shouldn't be a security concern. Any reason not to do this?
<abbr> also needs the title attribute to be useful.
<q> should probably produce “proper” double and
‘proper’ single quotes, at least for English text.
UPDATE 2019-12-27: Please also add
I needed it recently in
about a member's new web-app.
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