Highlight images without ALT attributes

accessibleImages.js

(function() {
	const style = document.createElement("style");
	style.setAttribute("media", "screen")
	document.head.appendChild(style);
	const sheet =  style.sheet;

  sheet.insertRule(`img[alt=""], img[alt="Alt Text"], img:not([alt]):not([role*="presentation"]){border:2px dashed red;}`)
  sheet.insertRule(`img[role*="presentation"], img[role*="none"]{border:2px solid blue;}`)
})();