The attribute value "auto" for "dir" (dir="auto") is html5. Several places it could be necessary to use this because the language direction is unknown, but as it is not defind as part of neither html 4.01 or xhtml 1.0 it would make it necessary to switch to html 5 to get consistent behavior.

Version: unspecified
Severity: normal
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=38488
https://bugzilla.wikimedia.org/show_bug.cgi?id=39257
https://bugzilla.wikimedia.org/show_bug.cgi?id=40051