Bug 263198

Created attachment 468232 [details] Four screenshots with and without the line visible taken at 125% scaling When the YouTube player gui is visible (i.e. when it is moused over, you can see seekbar, controls), a black line runs through YouTube content. It stays visible until the player controls time out and disappear. I think it might be hard to spot, since I think it is only 1 px wide in the images attached. It occurs only when I I encountered this on YouTube only (a generic html5 player and vimeo did not show it), in both fullscreen and windowed mode, and on other webkitgtk browsers (a more outdated epiphany rpm, tangram, and eolie (which is several years out of date). I also tried other websites, including Vimeo and a generic html5 video player, neither of which had the error. This only happens when GNOME's scaling is enabled, though both on integer 200% and experimental fractional scaling. If I set scaling to 100%, the line disappears. I will also report this to GNOME/mutter, but since this occured only on WebkitGTK browsers and affected every webkitgtk browser and version I tested, I am reporting it here as well. The only other issues I experienced were generally slower video loading than Firefox (but not egregiously so), no playback on drm websites like Netflix (obviously), and a complete failure to play livestreams on Twitch (though this occurs with fractional scaling disabled, so i assume this is a separate issue. I am running Fedora Workstation 38 on my Framework Laptop (i5-1240p with Intel Iris XE). I am using Wayland, GNOME 44.5, and kernel 6.5.5-200.fc38.x86_64. The screenshots were taken on the latest Epiphany 45 Flathub Flatpak: WebKitGTK 2.42.1 GStreamer 1.22.5 { "Version Information": { "WebKit version": "WebKitGTK 2.42.1 (tarball)", "Operating system": "Linux 6.5.5-200.fc38.x86_64 #1 SMP PREEMPT_DYNAMIC Sun Sep 24 15:52:44 UTC 2023 x86_64", "Desktop": "GNOME", "Cairo version": "1.17.8 (build) 1.17.8 (runtime)", "GStreamer version": "1.22.5 (build) GStreamer 1.22.5 (runtime)", "GTK version": "4.12.1 (build) 4.12.1 (runtime)" }, "Display Information": { "Type": "Wayland", "Screen geometry": "0,0 1803x1202", "Screen work area": "0,0 1803x1202", "Depth": "24", "Bits per color component": "8", "DPI": "96", "DRM Device": "/dev/dri/card1", "DRM Render Node": "/dev/dri/renderD128" }, "API": "OpenGL (libepoxy)", "Hardware Acceleration Information": { "Policy": "always", "WebGL enabled": "Yes", "Renderer": "DMABuf (Supported buffers: Hardware, Shared Memory)", "Native interface": "EGL", "GL_RENDERER": "Mesa Intel(R) Graphics (ADL GT2)", 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