axe-core/lib/rules/duplicate-id-misc-matches.js

Accessibility engine for automated Web UI testing

const { dom, aria } = axe.commons;
const id = node.getAttribute('id').trim();
const idSelector = `*[id="${axe.utils.escapeSelector(id)}"]`;
const idMatchingElms = Array.from(
	dom.getRootNode(node).querySelectorAll(idSelector)
);

return (
	idMatchingElms.every(elm => !dom.isFocusable(elm)) &&
	!aria.isAccessibleRef(node)
);