title: What are all the file types that are supported by the CSS property background-image?
body: <p>I cannot find any primary source documentation on what file types are supported by <code>background-image</code>. The <a href="https://www.w3.org/TR/CSS22/colors.html#propdef-background-image" rel="nofollow noreferrer">W3 specifications</a> specify &quot;visual&quot; media, but I cannot find a reference to file types.</p>