The Document.implementation property returns a DOMImplementation object associated with the current document.
The Document.implementation property returns a DOMImplementation object associated with the current document.
A DOMImplementation object.
js
const modName = "HTML"; const modVer = "2.0"; const conformTest = document.implementation.hasFeature(modName, modVer); console.log(`DOM ${modName}${modVer} supported?: ${conformTest}`); // Log: "DOM HTML 2.0 supported?: true" (hasFeature always returns true)
Warning: Do not use this for feature detection. The hasFeature() method always returns true.
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.
| Specification |
|---|
| DOM Standard # ref-for-dom-document-implementation① |
| 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 | 4.4 | 18 | 4 | ≤12.1 | 1 | 1.0 |
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https://developer.mozilla.org/en-US/docs/Web/API/Document/implementation