1. <audio>
  2. <video>
  3. <progress>
  4. <canvas>
  5. contenteditable
  6. dataset & data-* attributes
  7. getElementsByClassName
  8. input placeholder attribute
  9. section, article, aside, header, footer, nav, figure, figcaption, time, mark, main
  10. Offline web applications - Method of defining web page files to be cached using a cache manifest file, allowing them to work offline on subsequent visits to the page
  11. Spellcheck attribute - Attribute for input/textarea fields to enable/disable the browser's spellchecker.
  12. Range input type - Form field type that allows the user to select a value using a slider widget.