DOMImplementation.hasFeature()

Deprecated
This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.

The DOMImplementation.hasFeature() method returns a Boolean flag indicating if a given feature is supported. It is deprecated and modern browsers return true in all cases.

The different implementations fairly diverged in what kind of features were reported. The latest version of the spec settled to force this method to always return true, where the functionality was accurate and in use.

Syntax

flag = document.implementation.hasFeature(feature, version);

Parameters

feature
Is a DOMString representing the feature name.
version
Is a DOMString representing the version of the specification defining the feature.

Specifications

Specification Status Comment
DOM
The definition of 'DOMImplementation.hasFeature' in that specification.
Living Standard Modified to always return true except for SVG features.
Document Object Model (DOM) Level 3 Core Specification
The definition of 'DOMImplementation.hasFeature' in that specification.
Obsolete No change from Document Object Model (DOM) Level 2 Core Specification
Document Object Model (DOM) Level 2 Core Specification
The definition of 'DOMImplementation.hasFeature' in that specification.
Obsolete No change from Document Object Model (DOM) Level 1 Specification
Document Object Model (DOM) Level 1 Specification
The definition of 'DOMImplementation.hasFeature' in that specification.
Obsolete Initial definition.

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
Basic support
Deprecated
Chrome Full support YesEdge Full support YesFirefox Full support Yes
Notes
Full support Yes
Notes
Notes Since Firefox 19, hasFeature() mostly returns true.
IE Full support 6Opera Full support YesSafari Full support YesWebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support YesOpera Android Full support YesSafari iOS Full support YesSamsung Internet Android ?

Legend

Full support  
Full support
Compatibility unknown  
Compatibility unknown
Deprecated. Not for use in new websites.
Deprecated. Not for use in new websites.
See implementation notes.
See implementation notes.

See also

Document Tags and Contributors

Last updated by: connorshea,