"In short, I think that markup is too important to be left in the hands of the people who make content management systems. They all too often don’t care enough about it, and they can never know the context that you will be using it in, and so in my opinion they shouldn’t be trying to guess."

HTML Lint is a tool that makes sure your code looks good. While XHTML was very strict with syntax, HTML 5 is more lenient like previous versions of HTML, which means keeping consistent code styles will become more difficult. Validating is not good enough anymore.

SEO is really robot-centred design for robots that are practising user-centred design.

Read as much about HTML 5 as you like, but nothing works as well as rolling up your sleeves and writing real markup. Here’s where to begin. from a list apart.

HTML5 is the next generation of web markup, and the first web markup language created in the era of web applications. While we view many aspects of it quite favorably, we believe the specification could benefit from a few changes and clarifications, outlined below.

"...we discovered that many things we had previously considered serious problems were fixable issues related to language."

We, the undersigned...

HTML5 is the web equivalent of a circus tightrope act.

Belittling authors who prefer a stricter syntax is no way to explain technical differences between formats.

helping you implement html5 today

"Let there be peace among the semantic masses."

professional-grade production (conversion) of artwork.

plain old semantic HTML.

the more-important-than-you-think things. from sitepoint.

extracted attributes from styled elements.

a properly extensible solution that provides backward compatibility and sufficient flexibility. from a list apart.

the topic of extensible markup languages.

a diagnostic stylesheet can quickly reveal where your markup might have some trouble. from eric meyer.

annotating the web with meta information.