Typeset preview math in MathJax's TeX faces - #1
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Daria-E merged 1 commit intoAug 16, 2026
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The HTML-CSS output jax prefers fonts installed on the machine over MathJax's own, and its default availableFonts list names STIX. macOS ships STIX 1.x as system-reserved faces that WebKit resolves by name, so the preview selects them and typesets digits and operators in STIXGeneral-Regular, a Times-metric face indistinguishable from body text while identifiers still read as math italic. Browsers that do not enumerate those faces, such as Firefox, load MathJax's TeX fonts and render the same document correctly. An empty availableFonts list declines local fonts. preferredFont is nulled alongside it because MathJax tests the preferred font even when it is absent from availableFonts, so the list alone still takes the local path on a machine carrying MathJax's own TeX fonts. MathJax resolves its configuration, jax and fonts against the script element's own src, so script-src and font-src both derive their source expression from that URL rather than repeating the origin. Without the font-src entry the faces are blocked, and the output jax stalls for its web-font timeout before falling back to bitmap image fonts.
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The HTML-CSS output jax prefers fonts installed on the machine over MathJax's own, and its default availableFonts list names STIX. macOS ships STIX 1.x as system-reserved faces that WebKit resolves by name, so the preview selects them and typesets digits and operators in STIXGeneral-Regular, a Times-metric face indistinguishable from body text while identifiers still read as math italic. Browsers that do not enumerate those faces, such as Firefox, load MathJax's TeX fonts and render the same document correctly.
An empty availableFonts list declines local fonts. preferredFont is nulled alongside it because MathJax tests the preferred font even when it is absent from availableFonts, so the list alone still takes the local path on a machine carrying MathJax's own TeX fonts.
MathJax resolves its configuration, jax and fonts against the script element's own src, so script-src and font-src both derive their source expression from that URL rather than repeating the origin. Without the font-src entry the faces are blocked, and the output jax stalls for its web-font timeout before falling back to bitmap image fonts.