I'm testing the value that the atributes HTML into the links have in Google. What do you think about these results?


indexed => linked page not rank in serps
ignored => without results in Google
ranked => linked page rank in serps


The first test was an image and text into <a element, the code is:
<a href="keyword1.html" title="keyword2"><img src="keyword3.gif" alt="keyword4" title="keyword5"> keyword6</a>

Results

Filename: keyword1 is indexed (linked page not rank in serps)
Link title: keyword2 is ignored
Image name: keyword3 at the moment is ignored in search of the web, but this keyword is indexed in Google Images.
Image alt: keyword4 is indexed
Image title: keyword5 is ignored
Anchor text: keyword6 is ranked and indexed

The second test consisted of two links, the first is an image to URL1 and the second link is a text to URL1 The code is
<a href="keyword1.html" title="keyword2"><img src="keyword3.gif" alt="keyword4" title="keyword5"></a> <a href="keyword1.html" title="keyword6">keyword7</a>

Results

Filename: keyword1 is indexed
Link title: keyword2 is ignored
Image name: keyword3 at the moment is ignored in search of the web, but this keyword is indexed in Google Images
Image alt: keyword4 is ranked and indexed
Image title: keyword5 is ignored (now this is indexed becouse it had writed at the comments)
Link title: keyword6 is ignored
Anchor text: keyword7 is ranked

and indexed


The third test was similar to the second test but I have added other keyword at the end of the anchor text. The code is:
<a href="keyword1.html" title="keyword2"><img src="keyword3.gif" alt="keyword4" title="keyword5"></a> <a href="keyword1.html" title="keyword6">keyword7 anchor text keyword8</a>

Results

Filename: keyword1 is indexed
Link title: keyword2 is ignored
Image name: keyword3 not used in this test, the filename is a common name
Image alt: keyword4 is ranked and indexed
Image title: keyword5 is ignored
Link title: keyword6 is ignored
Anchor text: keyword7 is ranked and indexed
Last word anchor text:keyword8 is indexed but this key isn't ranked! :o

The image name (src="keyword.gif") and file name (href="keyword1.html") will be indexed, but this has a very low value in the algorithm by rank in the serps.

The title atributes into <a title=”keyword” and <img title=”keyword” elements are ignored by Google and neither are indexed, nor rank in the serps.