Mirroring/stretching of MathML operators in RTL text #28561
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hamishwillee
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Dec 2, 2025
| "spec_url": "https://w3c.github.io/mathml-core/#layout-of-operators", | ||
| "support": { | ||
| "chrome": { | ||
| "version_added": "144" |
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This is from https://cr-status.appspot.com/feature/6317308531965952 - note that I haven't tested this on Chrome.
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Tip: Review these changes grouped by change (recommended for most PRs), or grouped by feature (for large PRs). |
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FF146 adds support for mirroring MathML operators in RTL languages in https://bugzilla.mozilla.org/show_bug.cgi?id=1994172. It also adds support for stretching operators and grouping symbols (like braces) around expressions - does not have to be in RTL mode.
More correctly, it has supported operator mirroring for some time in normal text for some time but this hasn't worked properly with operators and stretching. Also previously the behaviour was non standard, and now it is part of the spec. From the developer:
This adds a subfeature to the mathML
dirglobal attribute, which I think is the best place to highlight this. Arguably you could add this subfeature to the<mo>,<msqrt>,<mfenced>since those are the specific affected elements. The relevant spec part is https://w3c.github.io/mathml-core/#layout-of-operators - if you need me to put it there instead I can.Related docs work can be tracked in mdn/content#41878