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Specification https://w3c.github.io/mathml-core/#layout-of-operators Summary Support for character-level and glyph-level mirroring when rendering MathML operators in right-to-left mode. When using RTL mode some operators can be mirrored by changing them to another code point (eg a right parentheses becomes a left parentheses). This is character-level mirroring, with equivalences defined by Unicode's `Bidi_Mirrored` property. There are operators that have no appropriate mirroring character. Glyph-level mirroring applies in this case, with the `rtlm` font feature, where another glyph can replace it in a mirrored context. Some existing implementations mirror the original glyph directly, but this may change the meaning for asymmetrical characters, such as the clockwise contour integral. Blink component Blink>MathML Web Feature ID mathml TAG review None TAG review status Not applicable Risks Interoperability and Compatibility None Gecko: Shipped/Shipping (https://bugzilla.mozilla.org/show_bug.cgi?id=945183) Working implementation shipping under the `mathml.rtl_operator_mirroring.enabled` feature. Planning to send an intent to ship. WebKit: In development Already has character-level mirroring. rtlm support is being worked on for the harfbuzz ports. Web developers: No signals Other signals: WebView application risks Does this intent deprecate or change behavior of existing APIs, such that it has potentially high risk for Android WebView-based applications? None Goals for experimentation Ongoing technical constraints None Debuggability None Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, ChromeOS, Android, and Android WebView)? Yes Is this feature fully tested by web-platform-tests? Yes New tests: - Character-level mirroring: checks that when switching text direction the codepoints of the characters change to the corresponding BidiMirrored equivalent (eg right to left parentheses) - Glyph-level mirroring: checks that the rtlm font feature is supported and that a specific glyph is used for certain characters when switching text direction. Flag name on about://flags None Finch feature name MathMLOperatorRTLMirroring Requires code in //chrome? False Tracking bug https://issues.chromium.org/issues/40120782 Estimated milestones DevTrial on desktop 140 DevTrial on Android 140 Link to entry on the Chrome Platform Status https://chromestatus.com/feature/6317308531965952 Links to previous Intent discussions Intent to Prototype: https://groups.google.com/a/chromium.org/d/msgid/blink-dev/686d2758.170a0220.a35ba.00d7.GAE%40google.com This intent message was generated by Chrome Platform Status. -- You received this message because you are subscribed to the Google Groups "blink-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to blink-dev+unsubscr...@chromium.org. To view this discussion visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/68ee55b8.050a0220.2a8282.0245.GAE%40google.com.
