scriptshift

This page uses <script type="module"> with relative import paths. Browsers usually block those imports from the file:// URL, so the polyfill will not run if you open this file directly from disk. Serve the repository root over HTTP and open this page from there, for example: python -m http.server 8080 then visit http://localhost:8080/scriptshift/index.html.

Tests for the scriptshift.js polyfill: MathML 4 subscriptshift / superscriptshift on msub, msup, and msubsup. Each row compares the default (no shift attribute) with a shifted script after _MathTransforms.transform runs. The blue border is tight and indicates the MathML element's bounding box.

`msub` — subscript baseline shifted down
Description	No `subscriptshift` (reference)	`subscriptshift="0.5em"` (polyfilled)
Simple subscript	$x_{0}$	$x_{0}$
Nested subscript (i sub j)	$A_{i_{j}}$	$A_{i_{j}}$

`msup` — superscript baseline shifted up
Description	No `superscriptshift` (reference)	`superscriptshift="0.5em"` (polyfilled)
Simple superscript	$x^{2}$	$x^{2}$
e to the t squared (nested superscript)	$e^{t^{2}}$	$e^{t^{2}}$

`msubsup` — sub down and super up
Description	No shift attrs (reference)	Both shifts (polyfilled)	Sub only / super only
Integral-style limits	$\int_{0}^{1}$	$\int_{0}^{1}$	$x_{a}^{b}$ $y_{c}^{d}$
Variable with sub/sup pair	$X_{i}^{j}$	$X_{i}^{j}$	$Z_{1}^{2}$ $W_{3}^{4}$

Pixel lengths

Sanity check with absolute lengths:

p_{1}, p^{2}, p_{3}^{4}