### Steps to reproduce 1. Enable `gfx.webrender.software` and restart Firefox. 2. Load recorded Zoom video https://mozilla.zoom.us/rec/play/x6QDxiEIXCNUCHkKSVqEEG6nGFYxjKAwCLZ3OooCAV4rv1SVpVIp8lpdHbMzQd8EBh0TSzHNSbv7p2xM.RQZiLaVWCetLJqzd. You will need a Mozilla LDAP account. ### Expected result No white line. ### Actual result The black video player has a white vertical line running down the middle. See the attached screenshot. If you play the video, the white line remains behind the video or turns into a shorter red or blue line behind the video. I have only tested on Windows. I can reproduce with `gfx.webrender.software.d3d11` = true or false. This is not a recent regression. I can reproduce the white line in Firefox 86, 87 Beta, and 88 Nightly.
Bug 1698009 Comment 0 Edit History
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### Steps to reproduce 1. Enable `gfx.webrender.software` and restart Firefox. 2. Load recorded Zoom video https://mozilla.zoom.us/rec/play/x6QDxiEIXCNUCHkKSVqEEG6nGFYxjKAwCLZ3OooCAV4rv1SVpVIp8lpdHbMzQd8EBh0TSzHNSbv7p2xM.RQZiLaVWCetLJqzd. You will need a Mozilla LDAP account. ### Expected result No white line. ### Actual result The black video player has a white vertical line running down the middle. See the attached screenshot. If you play the video, the white line remains behind the video or turns into a shorter red or blue line behind the video. I can reproduce on both Windows and macOS. On Windows, I can reproduce with `gfx.webrender.software.d3d11` = true or false. This is not a recent regression. I can reproduce the white line in Firefox 86, 87 Beta, and 88 Nightly.