Baseline Widely available
The Document.implementation property returns a DOMImplementation object associated with the current document.
A DOMImplementation object.
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.
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HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4