1269677 - mousethrough=always doesn't work on the APZ-enabled browser stack

Status: RESOLVED INVALID

(Core :: Panning and Zooming, defect)

Description

[Mike de Boer [:mikedeboer]]

In Firefox, the browser element is places inside a xul:stack, which has the useful property that elements are placed atop each other - like in a playing card deck - stretched in both axes.

When you insert a (semi-)transparent element inside the stack before the browser element, say a xul:box, with `box.setAttribute("mousethrough", "always")`, it is expected that all pointer events are directly applied on the element(s) below it, not the xul:box itself.

The name of the attribute is not apt anymore, because pointer events are not generated by more devices than just mice nowadays, but still I think the behavior of this attribute value should be clear enough.

Comment 1

[Kartikaya Gupta (email:[e-mail])]

Is this actually used in the browser front-end anywhere? Also, can you use the CSS pointer-events:none property to accomplish this instead? That should work with APZ and is not some deprecated XUL thing. From your description it sounds like they do the same thing.

Comment 2

[Mike de Boer [:mikedeboer]]

Kartikaya, you're brilliant! This works indeed.