Bug 289715

Summary: REGRESSION (286448@main): WKWebView content inset causes content touches to be off inside the web view
Product: WebKit Reporter: jfahrenkrug
Component: UI EventsAssignee: Wenson Hsieh <wenson_hsieh>
Status: RESOLVED FIXED    
Severity: Critical CC: jordan.hafer, karlo.m, webkit-bug-importer, wenson_hsieh
Priority: P2 Keywords: InRadar
Version: Other   
Hardware: iPhone / iPad   
OS: iOS 18   
Attachments:
Description Flags
Bug demo none

jfahrenkrug
Reported 2025-03-13 09:57:00 PDT
On iOS 18.4 beta setting a content inset on a WKWebView causes touches inside of the webview to be off by the content inset amount. In other words, when I display an element in the webview and the webview has a top content inset of 75 points, I have to tap 75 points above the actual element I want to tap. This makes any web content basically impossible to use when a content inset is present. A sample app demonstrating the issue can be found here: https://github.com/karlingen/iOS18.4-Webview-Bug The issue is not present in iOS 18.3 or 18.2. Thank you for addressing this!
Attachments
Bug demo (991.83 KB, image/gif)
2025-03-13 09:59 PDT, jfahrenkrug 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
jfahrenkrug
Comment 1 2025-03-13 09:59:37 PDT
Created attachment 474554 [details] Bug demo
Radar WebKit Bug Importer
Comment 2 2025-03-13 11:31:02 PDT Comment hidden (obsolete)
Alexey Proskuryakov
Comment 3 2025-03-13 11:32:55 PDT
Thank you for the report! Would it be possible to share the level of end user impact? Are there existing applications that are running into this?
Jordan
Comment 4 2025-03-13 11:54:31 PDT
Hi Alexey, thanks for your response. This is severely impacting basic functionality on our app which has about ~4 million monthly active devices.
Wenson Hsieh
Comment 5 2025-03-14 11:04:23 PDT
This regressed after my change in https://commits.webkit.org/286448@main; I'll have a fix out shortly. Thank you for reporting this (and sorry for the breakage!)
Wenson Hsieh
Comment 6 2025-03-14 11:31:16 PDT
Pull request: https://github.com/WebKit/WebKit/pull/42493
Jordan
Comment 7 2025-03-14 12:32:54 PDT
Thank you very much! Do you know if this fix will be included in the next iOS 18.4 beta?
Wenson Hsieh
Comment 8 2025-03-14 14:12:54 PDT
rdar://147075945
EWS
Comment 9 2025-03-14 17:30:18 PDT
Committed 292199@main (ca94e292f231): <https://commits.webkit.org/292199@main> Reviewed commits have been landed. Closing PR #42493 and removing active labels.
jfahrenkrug
Comment 10 2025-03-17 01:17:06 PDT
@Wenson Thank you very much for the super quick turnaround on this!
EWS
Comment 11 2025-03-19 09:37:55 PDT
Committed 289651.292@safari-7621-branch (5a4ffbab132f): <https://commits.webkit.org/289651.292@safari-7621-branch> Reviewed commits have been landed. Closing PR #2832 and removing active labels.
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