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
const flag = document.implementation.hasFeature(feature, version);
Parameters
feature- A
DOMStringrepresenting the feature name. version- A
DOMStringrepresenting 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
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
hasFeature | Chrome Full support Yes | Edge Full support 12 | Firefox
Full support
Yes
| IE Full support 6 | Opera Full support Yes | Safari Full support Yes | WebView Android Full support Yes | Chrome Android Full support Yes | Firefox Android Full support Yes | Opera Android Full support Yes | Safari iOS Full support Yes | Samsung Internet Android Full support Yes |
Legend
- Full support
- Full support
- Deprecated. Not for use in new websites.
- Deprecated. Not for use in new websites.
- See implementation notes.
- See implementation notes.
See also
- The
DOMImplementationinterface it belongs to.