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I found this table [1] that lists features specific to HTML 5.1 and their status in current versions of browsers.

[1] https://w3c.github.io/test-results/html51/implementation-rep...

I assume this document [1] may cover some changes.

[1]: https://www.w3.org/TR/2016/REC-html51-20161101/changes.html#...

Interesting that "Having title, or writing email to a friend does not make an img missing alt conformant." What if you write an email to an enemy? https://www.w3.org/TR/2016/REC-html51-20161101/changes.html#...

>What if you write an email to an enemy?

Then I would probably prefer to use <blink> and <marquee>.

What does that even mean?

There is also a diffed single page HTMLs at github [0], (11 MiB download; quite surprised my Firefox managed to render it).

What I've found interesting is that markup for insertions and deletions in this file is ("non-semantic") `<span class="delete">..</span><span class="insert">..</span>`, instead of presumably more semantically appropriate `<del>..</del><ins>..</ins>` [1].

[0] https://github.com/w3c/html/blob/master/diff/html5to51diff.h... [1] https://www.w3.org/TR/2016/REC-html51-20161101/edits.html#el...