In bug 1573438, I intend to remove support for the mode attribute on the
<math> element. This attribute is from MathML 1 and has been deprecated
from MathML 2 (released 16 years ago) in favor of the display attribute
[1] and we have been sending deprecation warnings since Mozilla 20
(released 6 years ago) [2]. It has never been implemented in WebKit,
Igalia does not plan to implement it in Chromium and the MathML Refresh
Community Group decided to remove it from MathML Core [3]

[1] https://www.w3.org/TR/MathML2/chapter7.html#interf.toplevel
[2] https://bugzilla.mozilla.org/show_bug.cgi?id=553917
[3] https://github.com/mathml-refresh/mathml/issues/5

Frédéric Wang
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