[whatwg] Proposal: Adding methods like getElementById and getElementsByTagName to DocumentFragments

[Zirak A]

Currently, a DocumentFragment only inherits from Node, and thus loses methods 
like getElementById. However, the Selector API 
(http://www.w3.org/TR/selectors-api/) defines querySelector and 
querySelectorAll on document fragments.
My proposal is to add getElementById (which makes sense, as the document 
fragment is a root node), getElementsByTagName (and its namespace-sensitive 
version), getElementsByClassName and getElementsByName - in short, all of the 
general selection methods available on the Document.