Here's a concise checklist for font designers who want all these stretchy math constructs (parentheses, brackets, braces, integrals, summations, etc.) to render beautifully and correctly in KaTeX, MathJax, TeX, or any math-aware engine.
- Math layout engines assemble tall symbols (like
⎛⎜⎝) by stacking multiple glyph parts, not by scaling one shape. - Each symbol family (parentheses, brackets, braces, integrals, summations) has top, middle/extender, and bottom pieces.
- Modern math fonts encode their geometry and stacking rules in an OpenType MATH table.