Question

I’m trying to make a snippet of javascript that can get a list of all images (or other resources) that are used in a web page because they are referenced in the css. Typically they are background images, because somewhere in the css there is something like this:

.something {
  background: transparent url(images/somethingbg.png) no-repeat top left;
  }

It seems I can get all of these into an array (with their full path) with the following snippet:

var outputArray = [];
var string = "";
var elems = document.getElementsByTagName('*');
for (var i = 0; i<elems.length; i++) {
 var elem = elems[i];
 var style = window.getComputedStyle(elem, null);
 var value = style.getPropertyValue("background-image");
 if (value && value != "" && value != "none")
  outputArray.push(value);
 }

However, I want this to work on any file out there (running as a bookmarklet), and I know url() can apply to things that aren’t background images, for instance “list-style-image”. Are there more? Is there a list of these somewhere?

Answer 1

AFAIK here’s a pretty exhaustive (?) list:

1. background-image (shorthand
   background) beware of multiple
   url("") in CSS3
2. list-style-image (shorthand
   list-style)
3. behavior (-ms-behavior), filter (-ms-filter), filter and -moz-binding
4. cursor
5. content
6. attribute selectors which contain URI
   values: href, cite, xmlns, src,
   data-*, data, codebase, classid, archive, longdesc, profile…
7. @import, @namespace and @font-face