It imports `/html/canvas/resources/canvas-tests.css`, that tries to load `/html/canvas/images/background.png` and fails. You can check that at https://wpt.live/html/canvas/element/pixel-manipulation/2d.imageData.object.ctor.basics.html
It imports
/html/canvas/resources/canvas-tests.css, that tries to load/html/canvas/images/background.pngand fails. You can check that at https://wpt.live/html/canvas/element/pixel-manipulation/2d.imageData.object.ctor.basics.html