Bug 163977 – REGRESSION(r190667): [GTK] Layout test fast/css/will-change/will-change-creates-stacking-context-inline.html is failing

• Status: RESOLVED
• Resolution: FIXED
• Component: WebKitGTK

[Michael Catanzaro]

Layout test fast/css/will-change/will-change-creates-stacking-context-inline.html has been broken since r190667 ("will-change should trigger stacking context based purely on properties"). Some of the boxes are no longer stacked as expected. Updating expectations accordingly.

[Simon Fraser (smfr)]

Why would gtk have different behavior from mac on this test?

[Michael Catanzaro]

Absolutely no clue! Three of the boxes in the middle are different than expected. See for example:

https://build.webkit.org/results/GTK%20Linux%2064-bit%20Release%20(Tests)/r207828%20(19045)/fast/css/will-change/will-change-creates-stacking-context-inline-diffs.html

And the related test (bug #163979):

https://build.webkit.org/results/GTK%20Linux%2064-bit%20Release%20(Tests)/r207828%20(19045)/fast/css/will-change/will-change-creates-stacking-context-diffs.html

[Simon Fraser (smfr)]

Looks like gtk doesn't support:
mix-blend-mode
isolation
-webkit-backdrop-filter
hence the differences.

[Michael Catanzaro]

OK, thanks for investigating it!

[Diego Pino]

Test is passing since r264968.