1382909 - Enable prerendering/OMTA for masked element

Status: NEW

(Core :: Web Painting, enhancement, P3)

Description

[u459114]

In Bug 1378710, we disable prerendering and OMTA of a mask element for fixing glitch rendering problem.

File this bug to enable it back again when we have a better solution.

Comment 1

[u459114]

I think we may not find a way to totally enable prerendering for a transform animation applied onto a masked element, but we can enable it under a specific condition

For image masks(none SVG mask) on elements with CSS boxing-layout,  here is a possible criteria of enabling prerendering:
* mask-repeat is repeat
* mask-position is initial value
* mask-size is initial value
* the masked element either has a defined background-color or a background-image which can cover padding-box area of the masked element.

We alse need to define passing criteria for image-mask onto an SVG-layout element/ SVG mask onto CSS-layout element/ SVG mask onto SVG-layput element.