Google indexes ‘title’ attribute in <a> tag
UPDATE: I was wrong. As pointed out here, the text “gdymov.com” is present on the page, although it is cloaked using CSS. Since I overtrusted the wordpress site, I didn’t check the source code of that page. Sorry for any inconvinience caused.
While searching I observed a strange phenomenon. For this search, look at the page codex.wordpress.org/Plugins/Statistics that appears 9th, the snippet says:
Backlinks (http://gdymov.com/inbound-links-backlinks-wordpress-plugin/): Draws a graph over how the number of incoming links (thus the name “Backlinks”) to …
but the text http://gdymov.com/inbound-links-backlinks-wordpress-plugin/ does not actually appear on the page. So, where did Google get this text? When I examined the source, I found that the ‘title’ attribute of the link contains this text. Thus, this proves that google indexes the content in the <a title='’ attribute.
For those that want really rigid evidence, I can say that this does not work with links that have no ‘title’ attribute (in this example, nothing shows up, though the page has a link to gdymov.com, but contains neither the text “gdymov.com” nor does the link have a ‘title’ attribute).