The DOMImplementation.hasFeature() method returns a Boolean flag indicating if a given feature is supported.

The different implementation fairly diverged in what kind of features was reported. The latest version of the spec settled to force this method to always return true, except for SVG features, where the functionnality was accurate and in use.


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


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


Browser compatibility

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support (Yes) 1.0 (1.7 or earlier) (Yes) (Yes) (Yes)
Always true for non-SVG features. ? 19.0 (19.0) ? ? ?
Feature Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support (Yes) 1.0 (1.0) (Yes) (Yes) (Yes)
Always true for non-SVG features. ? 19.0 (19.0) ? ? ?

See also