222187 2021-02-19 12:14:24 -0800 REGRESSION(iOS 14): Author shadow DOM invalidated unnecessarily on pseudo element change 2021-05-27 06:56:41 -0700 1 1 1 Unclassified WebKit CSS Safari 14 Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 225187 148695 1 ldebeasi webkit-unassigned cdumez changseok dino emilio esprehn+autocc ews-watchlist gyuyoung.kim jonesr koivisto marc mifenton rniwa sam simon.fraser webkit-bug-importer oldest_to_newest 1731500 0 421007 ldebeasi 2021-02-19 12:14:24 -0800 Created attachment 421007 Code Reproduction When using Web Components inside of the Shadow DOM that have CSS Variables set on the host, there is a significant delay in response to clicks/touches. It seems to be related to the number of instances of the component as well as the number of CSS Variables set on the host. I am only able to reproduce this on iOS 14.0+. This performance issue does not appear on earlier versions of iOS. I can also reproduce this on Safari 14 on macOS, but it is a bit easier to reproduce on iOS. Steps to reproduce: 1. Open code reproduction on an iOS device running iOS 14. 2. Tap the "Click Me" checkbox label. Notice that there is a delay between when the tap highlight appears and when the checkbox becomes checked. Repeat this process on a device running iOS 13 and you should notice that this delay does not occur. Additional Information: - I can reproduce this on STP 120 as well as iOS 14.5. - I cannot reproduce this in Chrome 88. - I took a Timeline sample and it appears that WebKit is spending significant amounts of time doing Style Recalculations whenever you try to check the checkbox. 1732072 1 marc 2021-02-22 02:34:56 -0800 I can confirm that I can reproduce this too, it is causing a lot of headaches for us and our product becomes unusable because of it. Please can this be addressed ASAP? Thanks, 1732302 2 rniwa 2021-02-22 14:18:01 -0800 Could you clarify the impact of this performance problem? Is it affecting a top website in UK? Is it affecting some major business operation? Any information regarding how much of a wide impact this bug has will help us prioritize it. 1732461 3 marc 2021-02-23 01:02:22 -0800 We have 5 iOS apps that this is affecting. We've only had a few complaints so far, but as more people update their devices this issue is going to become a bit of a show stopper for us. 1732630 4 rniwa 2021-02-23 11:36:45 -0800 (In reply to marc from comment #3) > We have 5 iOS apps that this is affecting. We've only had a few complaints > so far, but as more people update their devices this issue is going to > become a bit of a show stopper for us. Ah, didn't notice this was a iOS 14 regression. Would you be able to share which iOS apps they're? 1732802 5 marc 2021-02-24 01:05:40 -0800 Sure: https://apps.apple.com/gb/app/easybop-contracts/id1535194271 https://apps.apple.com/gb/app/easybop-smartforms/id1251453661 https://apps.apple.com/gb/app/planned-works-admin/id1373831653 https://apps.apple.com/gb/app/easybop-virtual-yard/id1471993245 https://apps.apple.com/gb/app/planned-works-financial/id1420108487 1733911 6 webkit-bug-importer 2021-02-26 12:15:13 -0800 <rdar://problem/74801314> 1736214 7 koivisto 2021-03-05 00:57:41 -0800 The test case has lots of custom element instances (some 6000) that each have a :host rule with a bunch of variable declarations. For some (immediately non-obvious) reason the button click causes a full style recalc on all shadow trees. That takes a while due to large number of style scopes as well as our suboptimal variables implementation. 1736217 8 koivisto 2021-03-05 00:58:29 -0800 If there is a regression here it is probably in style invalidation as a result of the checkbox click. 1736227 9 marc 2021-03-05 01:12:49 -0800 Personally, I'm not sure whether this is limited to click events. For the reason that the more and more elements you add, the slower scrolling and re-draws become. If you do a hard scroll down the page, all you see is the background colour and then the components appear after some time. This, as well as the click event issue, becomes worse as you increase the number of items on the page. Unless the click event is somehow causing that too. Thanks, 1736254 10 koivisto 2021-03-05 01:57:36 -0800 Yes, anything that triggers a style recalc is going to be slow with this content. 1736257 11 koivisto 2021-03-05 01:59:44 -0800 We really should implement shared style resolver for shadow trees with identical style. 1739333 12 marc 2021-03-15 02:12:44 -0700 Hi all, I was wondering if there has been any movement on this issue? We are getting more and more reports of it as clients update to 14. Thanks, 1756505 13 427654 koivisto 2021-05-04 05:58:11 -0700 Created attachment 427654 wip 1756508 14 koivisto 2021-05-04 06:05:48 -0700 The issue is that hovering the element causes us to invalidate the entire shadow tree style. Since everything here is in a shadow tree that's a big invalidation. The invalidation is triggered by the UA stylesheet having some :hover rules targeting pseudo elements in UA shadow tree. This should not require invalidation except for those specific elements. 1756573 15 427681 koivisto 2021-05-04 10:11:41 -0700 Created attachment 427681 patch 1756600 16 427688 koivisto 2021-05-04 11:09:20 -0700 Created attachment 427688 patch 1756663 17 427688 rniwa 2021-05-04 13:59:17 -0700 Comment on attachment 427688 patch View in context: https://bugs.webkit.org/attachment.cgi?id=427688&action=review > LayoutTests/fast/shadow-dom/shadow-style-invalidation-pseudo-element.html:1 > +<script src="../../resources/testharness.js"></script> Missing DOCTYPE? 1756796 18 ews-feeder 2021-05-04 21:38:26 -0700 Committed r277001 (237321@main): <https://commits.webkit.org/237321@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 427688. 1764175 19 ldebeasi 2021-05-26 19:27:03 -0700 I am testing this in STP 125 and it is better, but I can still reproduce the issue in other ways. If you try out my code reproduction and click the "Click Me" label (not the checkbox) multiple times rapidly you should see a slowdown again. Should I open another issue? 1764227 20 koivisto 2021-05-26 23:03:40 -0700 Please file a new bug, especially if it is worse than other browsers. The content here is inherently heavy though (some 6000 shadow trees with dozens of variables each). 1764243 21 marc 2021-05-27 01:10:55 -0700 @Antti, I would disagree that Liam should be raise a new bug, as the reported issue still exists, it's just slightly better than it was. So I would say that this issue is only partially fixed. We've already waited over 2 months for someone to look into this, are we going to have to wait another 2 months if another bug is raised? 1764318 22 ldebeasi 2021-05-27 06:56:41 -0700 I filed a new bug: https://bugs.webkit.org/show_bug.cgi?id=226330 Code example is the same, but steps to reproduce are slightly different. Let me know if you have questions. 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