Document: implementation property
The Document.implementation property returns a
DOMImplementation object associated with the current document.
Value
A DOMImplementation object.
Examples
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.
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
| Specification |
|---|
| DOM Standard # ref-for-dom-document-implementation① |
Browser compatibility
BCD tables only load in the browser