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font-synthesis-position CSS Property
The font-synthesis-position property controls whether the UA may synthesize sub/super (subscript/superscript) when the font lacks dedicated glyphs. Synthesis scales and offsets normal glyphs.
.math-strict {
font-synthesis-position: none;
}
.formula {
font-synthesis-position: auto;
font-variant-position: sub;
}
autoUA may synthesize sub/super when needed (default).noneSub/super synthesis disallowed — effect won't render without font support.
CSS Fonts Module Level 4
Editor's Draft
W3CMDN
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superscript, position subscript, bold and oblique typefaces.
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