Document.implementation

The Document.implementation property returns a DOMImplementation object associated with the current document.

Syntax

DOMImpObj = document.implementation;

Example

var modName = "HTML";
var modVer = "2.0";
var conformTest = document.implementation.hasFeature( modName, modVer );

alert( "DOM " + modName + " " + modVer + " supported?: " + conformTest );

// alerts with: "DOM HTML 2.0 supported?: true" if DOM Level 2 HTML module is supported.

A list of module names (e.g., Core, HTML, XML, etc.) is available in the DOM Level 2 Conformance Section.

Notes

The W3C's DOM Level 1 Recommendation only specified the hasFeature method, which is one way to determine if a DOM module is supported by a browser (see example above and What does your user agent claim to support?). If available, other DOMImplementation methods provide services for controlling things outside of a single document. For example, the DOMImplementation interface includes a createDocumentType method with which DTDs can be created for one or more documents managed by the implementation.

Specifications

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
implementation
1
12
1
6
≤12.1
1
1
18
4
≤12.1
1
1.0

Gecko-specific notes

  • Starting with Gecko 19.0 (Firefox 19.0 / Thunderbird 19.0 / SeaMonkey 2.16) the hasFeature method will always return true.

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https://developer.mozilla.org/en-US/docs/Web/API/Document/implementation