DOMImplementation: hasFeature() method

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

js
hasFeature(feature, version)

Parameters

feature

A string representing the feature name.

version

A string representing the version of the specification defining the feature.

Return value

A boolean value of true.

Specifications

Specification
DOM
# dom-domimplementation-hasfeature

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
hasFeature
Deprecated

Legend

Tip: you can click/tap on a cell for more information.

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

See also