In the spirit of creating diagrams, like Kathy Sierra does, I present you the diagram for the overlap between accessibility and Search Engine Optimisation (SEO). Not as good, but something is better than nothing.
This was a realisation that some activities did overlap for SEO and accessibility. In fact, I could say that accessibility is about allowing users to access content under all circumstances and SEO is about allowing search engines to access the content. SEO involves accessibility for search engines. Search engines today are at par with the Web users in terms of technology they can use. For example, both the browsers used by Web users and the search engines treat only the textual content as first class content, that is, they both can access only the textual content by default. For anything more there has to be support through additional behavior or plugins.
- Provide alternate text for non-textual content
- Use appropriate language
- Make sure that each and every piece of content is reachable. Search engines go deep within a web site through links, which can be said about users too. If access to the content is dependent on options or plugins, make sure you provide alternate access paths.
Of course each of these fields are separate and have more tasks to make them complete, but this thinking lets me attempt at the white hat SEO before other approaches. That is one of the reasons I left the circle for SEO transparent! On more thought, search engines are also a way of letting Web users access the content through search. SEO finally is about the users and not just the machines. There is a big overlap between the two, not only in the tasks, but also in their intent. I am not sure if I can ever optimize a web site for search engines, but I sure understand SEO better.
When I realised this, I did some search to ensure if this is an original idea. And what do you think, there are many more people out there who have thought about this many more times in many ways! So here are some links that can probably give new perspectives: