Blending in a group with opacity

[Mire]

Test case description

Set a background color for the SVG.
Create a group element containing a rect element filled with a different solid color.
Apply opacity less than 1 and isolation:auto on the group and a mix-blend-mode other than normal on the rect.

For details about the notations and more in-context information please refer to section In SVG, an element with isolation:auto set does not change the rendering behaviour of the test plan:
http://mire.github.io/css-blending-test-plan-proposal/css-blending-test-plan-proposal.html

Expected result

The rect will not mix with the content behind it.

W3C specification

This test case pertains to the following w3c specification:
http://www.w3.org/TR/compositing-1/

[wpt-issue-mover]

This issue has been merged into web-platform-tests/wpt#5555; please see that issue if you wish to discuss or work on this.