axe-core/lib/checks/media/description.js

Accessibility engine for automated Web UI testing

var tracks = axe.utils.querySelectorAll(virtualNode, 'track');

if (tracks.length) {
	// return false if any track has kind === 'description'
	var out = !tracks.some(({ actualNode }) => (
		(actualNode.getAttribute('kind') || '').toLowerCase() === 'descriptions'
	));
	return out;
}
// Undefined if there are no tracks - media may be decorative
return undefined;