The seo segment is a purely semantic segment targeting search engines, content aggregators and screen readers for the visually impaired. This is just minimal and well structured content in HTML - nothing more, nothing less. It's for machines, not for people.
The seo segment is defined by the following criteria:
- HTML or XHTML support
- No CSS support
Basically this is the first segment to consider when developing a new website. Make the search engines happy by structuring your content appropriately. In essence this is the core of the mobile-first approach. For inspiration on SEO HTML, check out our templator project.