1. autofocus
  2. Multiple file selection
  3. <meter>
  4. sandbox attribute for iframes - Method of running external site pages with reduced privileges (e.g. no JavaScript) in iframes.
  5. Session history management - Method of manipulating the user's browser's session history in JavaScript using history.pushState, history.replaceState and the popstate event.
  6. Content Security Policy 1.0 - Mitigate cross-site scripting attacks by whitelisting allowed sources of script, style, and other resources.
  7. hidden attribute
  8. Text API for Canvas - Method of displaying text on Canvas elements
  9. Data URIs - Method of embedding images and other files in webpages as a string of text
  10. spellcheck