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

[Scott González]

On Fri, Sep 6, 2013 at 8:20 AM, Simon Pieters <simonp at opera.com> wrote:

> So the use case is getting an element by id with an "untrusted" id as
> input, in an element or document fragment as opposed to the document?
>

Yes. Take the example of finding the input associated with a label:

<label for="foo">foo</label>
<input id="foo">

If you have a reference to the label and you want to find the input, you
need to escape the value of the for attribute before querying.