demo · v140

Arabic Equations

Arabic mathematical notation reads right-to-left, and operators have to mirror — but not all of them with a simple horizontal flip. Some get a different Unicode codepoint (parentheses), others rely on the rtlm OpenType feature for glyph-level mirroring. Toggle direction to see both layers at work.

direction:

character-level mirroring — parentheses

visible glyph (dir aware)

x+y

opens U+0028 LEFT PARENTHESIS / closes U+0029 — in rtl the browser swaps to opens U+0029 → closes U+0028 via Unicode Bidi_Mirrored.

integral

∮abf(x)dx

U+222E contour integral — asymmetric arrow. Browser uses the rtlm OpenType feature to mirror the glyph rather than swap codepoints.

Switch direction. Watch the parens swap codepoint; watch the integral hook reverse via the font's rtlm feature.

<math display="block" dir="rtl">
  <mo>&#x222E;</mo>       <!-- contour integral, mirrored via rtlm -->
  <mfenced open="(" close=")">
    <mi>x</mi>
  </mfenced>                 <!-- parens character-mirrored to ) / ( -->
</math>

see also