Disable mathvariant_styling_fallback by default
Categories
(Core :: MathML, task)
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(Reporter: fredw, Unassigned)
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(Blocks 1 open bug)
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(2 files)
no-math-font.jpg
See bug 1789083. Two years ago, Android didn't have fonts for the text-transform: math-auto but maybe this has changed in recent versions of Android.
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Comment 1•1 year ago
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(In reply to Frédéric Wang (:fredw) from comment #0)
See bug 1789083. Two years ago, Android didn't have fonts for bold/italic/bold-italic but maybe this has changed in recent versions of Android.
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Comment 2•5 months ago
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Comment 3•5 months ago
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Comment 4•5 months ago
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It seems this is causing mozilla/mathml/scripts/subscript-italic-correction.html to fail on "Android 7.0 x86-64 opt":
[task 2025-08-01T13:05:16.430+00:00] 13:05:16 INFO - TEST-UNEXPECTED-FAIL | /_mozilla/mathml/scripts/subscript-italic-correction.html | Italic correction of base is used to place subscripts. - assert_greater_than: expected a number greater than 2 but got 1
[task 2025-08-01T13:05:16.430+00:00] 13:05:16 INFO - verifyItalicCorrections@http://web-platform.test:8000/_mozilla/mathml/scripts/subscript-italic-correction.html:19:30
[task 2025-08-01T13:05:16.486+00:00] 13:05:16 INFO - TEST-OK | /_mozilla/mathml/scripts/subscript-italic-correction.html | took 556ms
which is likely related to the fallback not being used.
Also this does not make the following test pass:
So I guess we cannot remove this fallback yet on android.
At the moment Android still doesn't bundle any math font, which causes very poor rendering.
Debugging a page with math content on a Pixel 9 says that it is trying to render the characters using Roboto and Noto Sans Symbols. I checked with fontforge and neither of this fonts have characters for the "Mathematical Alphanumeric Symbols" block. Doing a font search, it seems to be using something close to Times New Roman Italic for rendering the mathvariant characters.
A font like Noto Sans Math (or Latin Modern Math) is misising. The source code shows that it is not bundled, since Noto fonts stopped being updated a year ago blocked by issue 366415133. There has been some attempts to update the fonts, but this was the response:
At this time, we're working on updating our infrastructure to handle font file updates via build flags. This means we're not able to integrate your patch in its current form.
I commented on this issue mentioning the importance of having a math font for proper rendering.
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