Add compat data for deprecated MathML 1 style attributes #17741
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These are very old attributes which were implemented in Gecko before the first release of Firefox and finally removed in version 83 [1] [2]. They were also in the initial MathML implementation of Safari and are still present in WebKit [3] [4]. They were briefly implemented in Chrome 24 (WebKit-based) when MathML was enabled but they are not implemented in the new version based on MathML Core [5]. [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1548524#c10 [2] https://bugzilla.mozilla.org/show_bug.cgi?id=1664488 [3] WebKit/WebKit@a1eb879 [4] https://github.com/WebKit/WebKit/blob/881a95924a0bece5346f923ab6e163d8ebf05b08/Source/WebCore/mathml/MathMLElement.cpp#L157 [5] https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/renderer/core/mathml/mathml_attribute_names.json5
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Summary
These are very old attributes which were implemented in Gecko before the first release of Firefox and finally removed in version 83 [1] [2].
They were also in the initial MathML implementation of Safari and are still present in WebKit [3] [4]. They were briefly implemented in Chrome 24 (WebKit-based) when MathML was enabled but they are not implemented in the new version based on MathML Core [5].
Test results and supporting details
[1] https://bugzilla.mozilla.org/show_bug.cgi?id=1548524#c10
[2] https://bugzilla.mozilla.org/show_bug.cgi?id=1664488
[3] WebKit/WebKit@a1eb879
[4] https://github.com/WebKit/WebKit/blob/881a95924a0bece5346f923ab6e163d8ebf05b08/Source/WebCore/mathml/MathMLElement.cpp#L157
[5] https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/renderer/core/mathml/mathml_attribute_names.json5
Related issues
mdn/content#20481