Highlight all Images without Alt Text

show-no-alt.css

/* Courtesy of @AllThingsSmitty "sharing is caring" https://twitter.com/AllThingsSmitty/status/930617039085035520 */
/* highlights any images on the page without alt text or with empty alt text */
/* note - sometimes empty alt text is correct: https://www.w3.org/WAI/tutorials/images/decorative/ */
img[alt=""], img:not([alt]) {
	border: red 5px solid;
}