[wdspec] test `emulation.setTimezoneOverride` (#53840)

Mirror RTL MathML operators

Add RTL text direction support for StretchyMathOperator, including both
character-level and glyph-level (rtlm) mirroring. Most of heavy lifting
is done by harfbuzz, we just need to pass it the correct direction.

Handle offsets of RTL operators so that they are centered. Fix incorrect
inline size calculation in radical operator painting.

Add two tests to verify character-level (operators) and glyph-level
(radicals) mirroring, along with two fonts that have different widths
for each mirrored character, allowing to check if it is performed
correctly.

Intent to Prototype: https://groups.google.com/a/chromium.org/g/blink-dev/c/iU0jQWJZCEM

MathML Core spec PR: w3c/mathml-core#277

R=fwang@igalia.com

Bug: 40120782
Change-Id: Idd01698d19bcc4de1813faf22d533db604dac4dd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6714505
Reviewed-by: Ian Kilpatrick <ikilpatrick@chromium.org>
Commit-Queue: Eri Pazos Pérez <eri@igalia.com>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1488792}

WebCryptoAPI: Fix failure tests for bare algorithm identifiers (#53832)

Followup to #53681 (comment).

Fix HTML doctype in Range-intersectsNode-2.html (#53829)

Remove "Content Visibility" from hidden=until-found test titles (#53828)

[check-layout-th.js] Make sure undefined titles don't cause extra out…

…put (#53827)

Co-authored-by: Anne van Kesteren <annevk@annevk.nl>

Fix "resoruces" typo in reuse-web-bundle-resource.https.tentative.html (

#53826)

Fix "XRInputSoruceEvent" typo in WebXR tests (#53825)

* Fix "Soruce" typo in events_session_select.https.html

* Fix "Soruce" typo in events_session_squeeze.https.html

Fix "soruce" typos in dialog-toggle-source.html (#53824)

Tweak fractional-translation-from-transform.html fuzziness further (#…

…53823)