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In order to screenshot the page and assert that it's monochrome, providing a regression test for #18694, the viewer background is configured to match the page background because screenshotting the page always captures a small part of the viewer background as well, and this way we can easily go over all pixels and check that they are all equal. However, in addition to configuring the viewer background the test also hides the toolbar and removes the page border. Especially the latter makes `scrollIntoView` fail in both Chrome and Firefox with recent Puppeteer versions, for reasons which remain a bit unclear. Fortunately both hiding the toolbar and removing the page border is not actually necessary (anymore) for the test to work, so we can simply remove those actions to fix the issue and reduce the amount of code. To make sure that the test still covers the original issue correctly we've reverted the changes from #18698 and then test still fails as expected. Fixes #19811. Fixes 68332ec2.