v144 · mathml · demo
Formula Builder
Compose any MathML expression from building blocks — numbers, operators, big operators, brackets, arrows — and watch both an LTR and RTL rendering update in real time. Discover which tokens mirror horizontally in RTL (highlighted in green) and which stay the same.
Preset formulas — load a classic expression to start
Building blocks — click any token to add it to your formula
Tokens with a green border are mirroring operators: in RTL mode the browser renders them as their horizontal mirror image (Unicode glyph mirroring + MathML directional rendering introduced in Chrome 144).
Your formula
Live preview — LTR vs RTL
Left-to-right
dir="ltr"
formula will appear here
Right-to-left — operators mirror
dir="rtl"
formula will appear here
MathML source
see also
- Mirroring of RTL MathML operators
- RTL Math — basic RTL rendering
- Operator Tester — LTR vs RTL operator comparison
- Textbook Gallery — Arabic/Hebrew textbook examples
- ChromeStatus entry
- Unicode TR9 (Bidi)
- MathML Core spec — operator layout