DOMImplementation.hasFeature()

Deprecated
This feature has been removed from the Web standards. Though some browsers may still support it, it is in the process of being dropped. 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

Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari
Basic support (Yes) (Yes) 1.0 (1.7 or earlier) (Yes) (Yes) (Yes)
Always true for non-SVG features. ? (Yes) 19.0 (19.0) ? ? ?
Always true 44.0 (Yes) 51.0 (51.0) ? ? ?
Feature Android Android Webview Edge Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile Chrome for Android
Basic support (Yes) (Yes) (Yes) 1.0 (1.0) (Yes) (Yes) (Yes) (Yes)
Always true for non-SVG features. (Yes) ? (Yes) 19.0 (19.0) ? ? ? No support
Always true No support 44.0 (Yes) 51.0 (51.0) ? ? ? 44.0

See also

Document Tags and Contributors

 Last updated by: arronei,