Most standard ways to get a favicon from a page, in preferred order
<link href="http://someserver/favicon.ico" rel="shortcut icon" />
<link href="http://someserver/favicon.ico" rel="shortcut" />
<link href="http://someserver/favicon.ico" rel="icon" />
<link href="http://someserver/favicon.png" rel="apple-touch-icon" />
<link href="http://someserver/favicon.png" rel="apple-touch-icon-precomposed" />
<link href="http://someserver/favicon.ico" rel="image_src" />
Don't forget to match arbitrary orders of attributes, eg
<link rel="apple-touch-icon" sizes="72x72" href="apple.png" />
- Current dir:
http://someserver/directory/favicon.ico
- Root dir:
http://someserver/favicon.ico
<meta content="http://someserver/favicon.ico" itemprop="image" />
<meta content="http://someserver/favicon.ico" property="og:image" />