document.designMode controls whether the entire document is editable. Valid values are "on" and "off". According to the specification, this property is meant to default to "off". Firefox follows this standard. The earlier versions of Chrome and IE default to "inherit". Starting in Chrome 43, the default is "off" and "inherit" is no longer supported. In IE6-10, the value is capitalized.

Syntax

var mode = document.designMode;
document.designMode = "on" || "off";

Example

Make an <iframe>'s document editable:

iframeNode.contentDocument.designMode = "on";

Specifications

Specification Status Comment
HTML Living Standard
The definition of 'designMode' in that specification.
Living Standard Initial definition.

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
designModeChrome Full support 45
Notes
Full support 45
Notes
Notes Before Chrome 64, this property was accessed through the HTMLDocument alias.
Edge Full support 12Firefox Full support YesIE Full support YesOpera Full support YesSafari Full support YesWebView Android Full support 45
Notes
Full support 45
Notes
Notes Before Chrome 64, this property was accessed through the HTMLDocument alias.
Chrome Android Full support 45
Notes
Full support 45
Notes
Notes Before Chrome 64, this property was accessed through the HTMLDocument alias.
Edge Mobile ? Firefox Android ? Opera Android Full support YesSafari iOS Full support YesSamsung Internet Android ?

Legend

Full support  
Full support
Compatibility unknown  
Compatibility unknown
See implementation notes.
See implementation notes.

See also