[cssom-view] offsetParent zoom handling seems wrong.

[emilio]

https://drafts.csswg.org/cssom-view/#dom-htmlelement-offsetparent has:

The element has a non-default used value of zoom.

But afaict that's not what's implemented in engines. What's implemented is "The element has a different used value of "zoom".

Is my read of the WebKit / Blink code correct @chrishtr? If so we should update the spec. We have tests that depend on that difference.

[chrishtr]

Is my read of the WebKit / Blink code correct @chrishtr?

Yep you're right. Good catch. I'll make a PR to fix the spec.