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copied!<p>Check out the W3C's <a href="http://www.w3.org/TR/REC-html40/index/attributes.html" rel="nofollow noreferrer">list of HTML attributes</a>, there's a "type" column in there and just look for URI types.</p> <p>And of course the <a href="https://www.w3.org/TR/html5/index.html#attributes-1" rel="nofollow noreferrer">HTML 5 version of that list</a> is useful too <em>(edit: updated link for HTML 5.2 <a href="https://www.w3.org/TR/2017/REC-html52-20171214/fullindex.html#attributes-table" rel="nofollow noreferrer">here</a>)</em></p> <p>So for HTML4 we've got:</p> <ul> <li><code><a href=url></code></li> <li><code><applet codebase=url></code></li> <li><code><area href=url></code></li> <li><code><base href=url></code></li> <li><code><blockquote cite=url></code></li> <li><code><body background=url></code></li> <li><code><del cite=url></code></li> <li><code><form action=url></code></li> <li><code><frame longdesc=url></code> and <code><frame src=url></code></li> <li><code><head profile=url></code></li> <li><code><iframe longdesc=url></code> and <code><iframe src=url></code></li> <li><code><img longdesc=url></code> and <code><img src=url></code> and <code><img usemap=url></code></li> <li><code><input src=url></code> and <code><input usemap=url></code></li> <li><code><ins cite=url></code></li> <li><code><link href=url></code></li> <li><code><object classid=url></code> and <code><object codebase=url></code> and <code><object data=url></code> and <code><object usemap=url></code></li> <li><code><q cite=url></code></li> <li><code><script src=url></code></li> </ul> <p>HTML 5 adds a few (and HTML5 seems to not use some of the ones above as well):</p> <ul> <li><code><audio src=url></code></li> <li><code><button formaction=url></code></li> <li><code><command icon=url></code></li> <li><code><embed src=url></code></li> <li><code><html manifest=url></code></li> <li><code><input formaction=url></code></li> <li><code><source src=url></code></li> <li><code><track src=url></code></li> <li><code><video poster=url></code> and <code><video src=url></code></li> </ul> <p>These aren't necessarily simple URLs:</p> <ul> <li><code><img srcset="url1 resolution1 url2 resolution2"></code></li> <li><code><source srcset="url1 resolution1 url2 resolution2"></code></li> <li><code><object archive=url></code> or <code><object archive="url1 url2 url3"></code></li> <li><code><applet archive=url></code> or <code><applet archive=url1,url2,url3></code></li> <li><code><meta http-equiv="refresh" content="seconds; url"></code></li> </ul> <p>SVGs can also contain links to resources: <code><svg><image href="url" /></svg></code></p> <p>In addition, the <code>style</code> attribute can contain css declarations with one or several urls. For example: <code><div style="background: url(image.png)"></code></p>

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