Bug 245510 – backdrop-filter: url(#some-svg-filter) doesn't work with SVG filters like feDisplacementMap

• Status: NEW
• Component: CSS

[Julius Tarng]

Created attachment 462523 [details]
Compare chrome (left) and safari (right) displacement

Reproduction: https://codepen.io/tarngerine/pen/poVrLEe
Expected: See feDisplacementMap filter effect the "Hello" text
Actual: No effect

Given an HTML element with CSS applied `backdrop-filter`, with a `url(#...)` referencing an SVG `<filter>`, the filter will not be properly applied. It works in Chromium (see attachment)

[Ahmad Saleem]

I am able to reproduce this in Safari 16 and Safari Technology Preview 154 and it does not show any effect on "Hello" while Chrome Canary 108 does show distortion effect and Firefox does not show similar to Safari but it could be due to -webkit-. Thanks!

[Radar WebKit Bug Importer]

<rdar://problem/100539266>

[Said Abou-Hallawa]

Created attachment 462714 [details]
Simpler repro test case

SVG color matrix filters as backdrop-filters don't seem to work either?

e.g. defining
    <svg xmlns="http://www.w3.org/2000/svg" width="0" height="0">
        <filter id="matrix-test">
            <feColorMatrix type="matrix" 
                values="1 0 0 0 0
                        0 0 0 0 0
                        0 0 0 0 0
                        0 0 0 1 0">
            </feColorMatrix>
        </filter>
    </svg>

and setting
    -webkit-backdrop-filter: url(#matrix-test);
    backdrop-filter: url(#matrix-test);

works in firefox, brave, chrome, etc, but not Safari.

[Vanyadoing]

Created attachment 467229 [details]
-webkit-backdrop-filter: url() doesn't work under Mac and IOS

Almost the year passed from bug discovering? Would it be fixed?

[Vanyadoing]

Comment on attachment 467229 [details]
-webkit-backdrop-filter: url() doesn't work under Mac and IOS

https://codepen.io/vanyadoing/pen/YzRbZEQ

[Vanyadoing]

Here is where the bug can be checked

https://codepen.io/vanyadoing/pen/YzRbZEQ