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Rails 3 uses a default DOCTYPE of HTML 5:
<!DOCTYPE html>
except a few lines below, it has
<meta name="csrf-param" content="authenticity_token"/>
I thought the HTML syntax is never to have the self-closing tags? (only XHTML/XML uses that, no?)
in HTML5, it is actually compliant to have self closing tags on void element such as meta, img, input, etc.
Ref: http://www.whatwg.org/specs/web-apps/current-work/#start