The HTML autocorrect attribute allows web authors to control whether autocorrection should be applied to user input in editable elements including <input>, <textarea>, and contenteditable hosts. The feature makes the 'autocorrect' attribute to be exposed to web authors.
The 'autocorrect' HTML attribute has been implemented long ago, but since it's not defined in any exported IDL, websites fail to detected it as supported.
Samples: https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Global_attributes/autocorrect#examples