Attribute-name table is missing `strokeLinecap`/`strokeLinejoin` — camelCase leaks into HTML output

[gtritchie]

What's the problem?

The react→html attribute-name table is missing strokeLinecap and strokeLinejoin, while the rest of the SVG presentation-attribute family converts (strokeWidth, strokeOpacity, fillOpacity, fillRule, clipPath, fontSize, textAnchor, vectorEffect, paintOrder all map correctly). The two missing names pass through camelCase — invalid in HTML output, so browsers ignore them.

The gap shows up on every path that consults the table:

• the markdownToHtml serializer (repro below), and
• the MDX compile path with elementAttributeNameCase: "html", for nested children of an appendChild subtree (root-node/setProperty properties bypass the table entirely — that's the separate elementAttributeNameCase: "html" is not applied to appendChild root properties or setProperty names (nested children convert) #192).

Repro (node repro.mjs):

import { markdownToHtml, defineHastPlugin } from 'satteri';

const plugin = defineHastPlugin({
  name: 'repro',
  element: {
    filter: ['p'],
    visit(node, ctx) {
      ctx.appendChild(node, {
        type: 'element',
        tagName: 'svg',
        properties: { strokeWidth: '1.2', strokeLinecap: 'round', strokeLinejoin: 'miter' },
        children: [],
      });
    },
  },
});

const { html } = await markdownToHtml('hello', { hastPlugins: [plugin] });
console.log(html);

Output (satteri 0.9.5 — identical on 0.9.1):

<p>hello<svg stroke-width="1.2" strokeLinecap="round" strokeLinejoin="miter"></svg></p>

Amusingly, strokeLinecap ↔ stroke-linecap is the example pair in the elementAttributeNameCase doc comment in compile.d.ts:

/**
 * Casing for HTML/SVG attribute names on plain (rehype-produced) elements.
 *
 * - `"react"` (default): `className`, `htmlFor`, `strokeLinecap`, `xmlLang`.
 * - `"html"`: `class`, `for`, `stroke-linecap`, `xml:lang`.
 * ...
 */

Workaround: write these names kebab-case in plugin properties — unknown names pass through verbatim on every path.

Environment Information

• satteri npm v0.9.5 (reproduced identically on v0.9.1), prebuilt binary @bruits/satteri-darwin-arm64
• macOS 26.6 (arm64)
• Rust: n/a (prebuilt NAPI binary)
• Node.js v24.18.0

What's the expected result?

<p>hello<svg stroke-width="1.2" stroke-linecap="round" stroke-linejoin="miter"></svg></p>

strokeLinecap and strokeLinejoin convert like the rest of the stroke/fill family. Worth sweeping the table against React's known SVG attribute list while in there, in case other names are missing.