[Markdown] HTML tags <abbr> and <dfn> aren't rendering in GFM

[samkhan1]

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The following expected behaviour of html tags in GFM isn't working -

<abbr title="Github Flavoured Markdown">GFM</abbr> needs to render the tagged text with dots bellow it, which should show the specified title as a tip upon hovering over the tagged text.

Similarly, the <dfn> tag isn't being rendered properly in GFM.

Refernce:

• https://www.w3schools.com/tags/tag_abbr.asp
• https://www.w3schools.com/tags/tag_dfn.asp

[queenofcorgis]

Thanks for posting in the GitHub Community, @samkhan1 !

We're happy you're here. You are more likely to get a useful response if you are posting your question in the applicable category, the Issues category is solely related to conversations around the GitHub products Issues and Projects. I've gone ahead and moved it for you. Good luck!

[ju1ius]

References to the real HTML specification are always better than w3schools 😉 !

• <abbr>
• <dfn>

In addition to that, support for the dfn[id] attribute would be much welcome so that we can:

Define <dfn id="the-term">a term</dfn>...
...and later on link to the definition of [this term](#the-term).

[roke-julian-lockhart]

@ju1ius and @samkhan1, talk.commonmark.org/t/3701 discusses adding this to CommonMark, in lieu of more comprehensive WHATWG HTML5 LS support in GHFM. Regardless, in lieu of that, I have filed github/markup/issues/2044. However, note github-linguist/linguist/issues/7637#issuecomment-3411091064…