[Gecko Bug 1649639] Add WPT and remove unnecessary MOZ_ASSERT
of `HTMLEditor::ClearStyleAt
#28410
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When the method detects the style coming from a parent block, the
MOZ_ASSERT
checks whether the current mode is "style with CSS" or not because currently,
HTMLEditor
does not use<span>
with CSS when the mode is not "style withCSS". However, fixing it requires bigger patch, and the change does not match
with the bug's summary. So, I just remove the
MOZ_ASSERT
, add WPT and filedbug 1649639 for the root issue.
Differential Revision: https://phabricator.services.mozilla.com/D111067
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1649639
gecko-commit: ca0c86fb52d92389c1d93dae05d011843aef3290
gecko-reviewers: m_kato