The interface is officially called "URL decomposition IDL attributes." IIRC it's only implemented by <a/>, <area/> and the Location object. Here are the canon

The interface is officially called "URL decomposition IDL attributes." IIRC it's only implemented by <a/>, <area/> and the Location object. Here are the canonical docs: http://dev.w3.org/html5/spec-LC/urls.html#interfaces-for-url-manipulation http://dev.w3.org/html5/spec-LC/urls.html#interfaces-for-url... And here's a prettier (but less detailed) version: http://developers.whatwg.org/urls.html#interfaces-for-url-manipulation http://developers.whatwg.org/urls.html#interfaces-for-url-ma...