Remove designMode inheritance from ancestors

Change the initial value of document.designMode from "inherit" to "off" and remove support for "inherit".


Firefox already implements this behavior, and IE effectively implements it as well. The proposed behavior also matches the spec and removes implementation complexity for out-of-process iframes.


Established standard

Status in Chromium


Enabled by default (tracking bug) in:

  • Chrome for desktop release 43
  • Chrome for Android release 43
  • Android WebView release 43
  • Opera release 30
  • Opera for Android release 30

Consensus & Standardization

  • No public signals
  • No public signals
  • No public signals
  • No signals


Last updated on 2017-06-14