DOMImplementation.hasFeature - Web API 接口参考 编辑

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.

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

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!

• Desktop
• Mobile

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

• The DOMImplementation interface it belongs to.