Re: devtools highlighter

On 2014-03-23, 6:07 AM, Robert O'Callahan wrote:
> On Fri, Mar 21, 2014 at 9:55 PM, Patrick Brosset <[email protected]>wrote:
>
>> We're struggling with a limitation related to the devtools highlighter
>> (the outline you see in this video:
>> https://www.youtube.com/watch?v=zBYEg40ByCM).
>> Today, the highlighter is created with XUL nodes that are appended in the
>> browser XUL markup, in one of the parent elements of the page currently
>> being inspected. These XUL nodes are absolutely positioned over the element
>> being highlighted.
>>
>> This technique has served us well until we wanted our devtools to work on
>> Fennec, Fxos and E10S mode. In these cases, the page being inspected
>> doesn't have a reachable parent element that we can use to append our
>> highlighter elements, and appending it inside the content page itself isn't
>> really a viable option because we don't want to impact the content in any
>> way.
>>
>
> I think you need an API to add anonymous content to the root element of the
> page. We don't have such an API at the moment but it might not be hard to
> add.

Bug 924692 is making the canvas frame have a native anonymous content. 
If that is where you would like to stick that element in, then art of 
the frame constructions bits is being done in that bug.

Cheers,
Ehsan