The spellcheck Attribute

The spellcheck attribute specifies if the browser should check the spelling. The allowed values for the spellcheck attribute are true and false.

true means that spellchecking is enabled. false means that spellchecking is disabled.

      <textarea spellcheck="true">This is a text.</textarea>
  HTML CSS Book 

HTML5 Global Attributes:
  1. The accesskey Attribute
  2. The class Attribute
  3. The contenteditable Attribute
  4. The contextmenu Attribute
  5. The dir Attribute
  6. The draggable Attribute
  7. The dropzone Attribute
  8. The hidden Attribute
  9. The id Attribute
  10. The lang Attribute
  11. The spellcheck Attribute
  12. The style Attribute
  13. The tabindex Attribute
  14. The title Attribute