Possible Duplicate:Will my new HTML5 website decrease my Google ranking? For example, currently, I understand that search engines give the most emphasis to h1 elements, followed by h2, etc. However, it is valid in HTML5 to replace what is conventionally h2 with h1, encased in article tags.But are search engines such as Google updated to become HTML5 friendly? Or will my site somehow be penalized by some algorithm for h1ing incorrectly? 
Will HTML5 adoption render my site search engine unoptimized?
html5;google;seo