Function adjustForeignAttrs

lib/html/syntax.js:5243–5274

(
		/** @type {HtmlAttribute[]} */ attrs,
		/** @type {number} */ ns
	)

	const adjustSvgTag = (/** @type {string} */ name) =>
		/** @type {Record<string, string>} */ (SVG_TAG_ADJUST)[name] || name;
	const adjustForeignAttrs = (
		/** @type {HtmlAttribute[]} */ attrs,
		/** @type {number} */ ns
	) => {
		// Reuse the original array/objects until an attribute actually needs
		// adjusting; unchanged attributes keep serializedName === undefined and
		// the serializer falls back to `name`. Avoids a new array + object per
		// attribute on every foreign element.
		let out = attrs;
		for (let i = 0; i < attrs.length; i++) {
			const a = attrs[i];
			let name = a.name;
			/** @type {string | undefined} */
			let serializedName;
			if (
				ns === NS_SVG &&
				/** @type {Record<string, string>} */ (SVG_ATTR_ADJUST)[name]
			) {
				name = /** @type {Record<string, string>} */ (SVG_ATTR_ADJUST)[name];
				serializedName = name;
			}
			if (/** @type {Record<string, string>} */ (FOREIGN_ATTR_NS)[a.name]) {
				serializedName = /** @type {Record<string, string>} */ (
					FOREIGN_ATTR_NS
				)[a.name];
			}
			if (name === a.name && serializedName === undefined) continue;
			if (out === attrs) out = [...attrs];
			out[i] = { ...a, name, serializedName };
		}
		return out;
	};

	const foreignContent = (/** @type {Token} */ t) => {
		if (t.type === TOKEN_CHAR) {