207516 2020-02-10 16:08:43 -0800 Flash of white can occur if JS forces an early layout 2020-02-13 17:31:12 -0800 1 1 1 Unclassified WebKit Layout and Rendering WebKit Local Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 nham nham bfulgham commit-queue koivisto nham simon.fraser webkit-bug-importer zalan oldest_to_newest 1617157 0 390306 nham 2020-02-10 16:08:43 -0800 Created attachment 390306 repro case In https://bugs.webkit.org/show_bug.cgi?id=134833, we added in a hack to force a layer flush on first layout on Mac (rather than waiting for first non-empty layout as we do for all other platforms). This can cause a flash of white if the first layout creates an empty render tree, e.g. if JS forces an empty layout early on in the page. We also see this flash-of-white issue in several real-world webpages on our PLT test suite, e.g. NYT and FB. We should probably revert this change. This fixes the issue in our PLT content and in the attached repro case (which can be run by executing something like `php -S localhost:8081` and then navigating to http://localhost:8081). 1617160 1 webkit-bug-importer 2020-02-10 16:09:37 -0800 <rdar://problem/59329999> 1617188 2 390315 nham 2020-02-10 16:47:44 -0800 Created attachment 390315 Patch 1617190 3 nham 2020-02-10 16:50:04 -0800 I've verified that this patch fixes the repro case as well as the flash of white on NYT and FB PLT content. I'm also kicking off some PLT5 A/B tests to make sure this doesn't cause a perf regression. I don't anticipate one since in theory an extra paint on FirstLayout should not cause DidFirstVisuallyNonEmptyLayout to fire any later (if anything, it could marginally help). 1617205 4 nham 2020-02-10 17:00:45 -0800 The original reason why we did https://bugs.webkit.org/show_bug.cgi?id=134833 years ago was for a scenario like this: 1. Open Safari with status bar enabled 2. Cmd+F for some text on a page 3. Click on some link with the find bar still open 4. A 20px white gap appears where the status bar used to be I can no longer repro this issue with the current Safari with the current patch (which is good). 1617436 5 koivisto 2020-02-11 09:42:53 -0800 Might want to check if those test failures are real. 1618678 6 nham 2020-02-13 13:15:13 -0800 *** Bug 204828 has been marked as a duplicate of this bug. *** 1618784 7 390704 nham 2020-02-13 16:46:06 -0800 Created attachment 390704 Patch 1618785 8 nham 2020-02-13 16:50:06 -0800 The latest patch should fix the test failures. * fast/scrolling/rtl-scrollbars-listbox-scroll.html: This test was scrolling a list box from an inline script as the main resource was being parsed. Since the list box is not enough to be considered visually significant, after this patch we don't render the list box until after the inline script executes. Fixed by moving the scrolling code to after the document finishes loading. * imported/w3c/web-platform-tests/css/css-transitions/before-load-001.html: As the top of this file indicates, this doesn't actually test behavior specified in the standard. It produces different results depending on when first paint occurs. As a result, we had already skipped this test on iOS where it was failing (https://bugs.webkit.org/show_bug.cgi?id=203416). Since this patch makes Mac first paint behave like iOS first paint, I propose skipping this test on Mac as well for now and tracking fixing the test for both iOS and Mac in https://bugs.webkit.org/show_bug.cgi?id=203416. 1618790 9 nham 2020-02-13 17:00:19 -0800 Also, according to the A/b bots, this is a 1.75% - 3% improvement on PLT5 for Mac. 1618807 10 390704 commit-queue 2020-02-13 17:31:10 -0800 Comment on attachment 390704 Patch Clearing flags on attachment: 390704 Committed r256577: <https://trac.webkit.org/changeset/256577> 1618808 11 commit-queue 2020-02-13 17:31:12 -0800 All reviewed patches have been landed. Closing bug. 390306 2020-02-10 16:08:43 -0800 2020-02-10 16:08:43 -0800 repro case ForceBlankLayout.zip application/zip 1407 nham UEsDBBQAAAAAADB2SlAAAAAAAAAAAAAAAAARACAARm9yY2VCbGFua0xheW91dC9VVA0AB/3dQV79 3UFe/d1BXnV4CwABBPUBAAAEUAAAAFBLAwQUAAgACACFfkpQAAAAAAAAAACvAgAAGwAgAEZvcmNl QmxhbmtMYXlvdXQvaW5kZXguaHRtbFVUDQAHq+xBXrfsQV6r7EFedXgLAAEE9QEAAARQAAAAXVKx chQxDK25r1C2TvaSghmKvaUJMxSU8AGKrb0TY1uOLYXc3yPfQgGVbenpSe/Jy12UoNdKcNGc1sMy DkhYzqeJyjQChHE9fFgyKUK4YOukp8l0e/g0jbiyJlqfKeEVvlPX5bhHDstxL11eJF4HsofGVaG3 cJo2aYEevEZM5599Wpfjnv4fGAfxXC/18+12+vj4+C/48rR+pZQEfklL8c67Po1wXb9Jowxcu2WI kqRBZwV0HfcQpHQKSmoNMHLlHricgRJ7slP0AiC2niWCUq5ezCVw5GhFwdQdenF6IN2pCTKeCwIm fjWc4YcCFc7ODZnH5c2fmO/h1bhDka7NItA7tcCKylLAUsIcZGceIO48Ot0ouToYyBcg2WeSXYC3 0hmeByWaEnAzn2TXygUa1UYXKpGaC/fAmySr3o58HFcK1DtB4JT+OuSCDDY7MyqUMRBUbP6wNsOX 90BVyYaN7oGEgBQcF6xyRB0VrqI24UhluDic8qbBUsWhG2TbODBCpE5tZLOkMQYOg9jt6H98tTz7 Bo91/KH98/hWb9/zN1BLBwg1kxjSnwEAAK8CAABQSwMEFAAIAAgA5HZKUAAAAAAAAAAAbQAAABoA 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