Mastodon Advanced View: Highlight Missing Alt Text

styles.css

.media-gallery__item-thumbnail:has(img:not([alt])) {
	position: relative;
}

.media-gallery__item-thumbnail:has(img:not([alt]))::after {
	align-items: center;
	background: rgb(191, 64, 64);
	border-radius: 4px;
	color: #fff;
	content: 'No alt';
	display: flex;
	height: 23.1429px;
	padding: 2px 0.66em;
	position: absolute;
	right: 4px;
	text-transform: uppercase;
	top: 4px;
}