Google says images styled with CSS won’t be indexed in Image Search, advising developers to use HTML tags for important visuals.

Add a short CSS class to an HTML Web page to use animated and stationary GIF images as the page's background.

Google's John Mueller reminded us that when it comes to your CSS background images, Google won't be indexing or ranking those images in image search. John Mueller said on Twitter "last I checked ...

One way to add a background photo to any custom Tumblr theme is to embed a simple CSS tag at the right location in the theme's HTML code.