Bug 289715 – REGRESSION (286448@main): WKWebView content inset causes content touches to be off inside the web view

• Status: RESOLVED
• Resolution: FIXED
• Component: UI Events

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!

Created attachment 474554 [details]
Bug demo

[Radar WebKit Bug Importer]

<rdar://problem/146970261>

[Alexey Proskuryakov]

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]

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]

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]

Pull request: https://github.com/WebKit/WebKit/pull/42493

[Jordan]

Thank you very much! Do you know if this fix will be included in the next iOS 18.4 beta?

[Wenson Hsieh]

rdar://147075945

[EWS]

Committed 292199@main (ca94e292f231): <https://commits.webkit.org/292199@main>

Reviewed commits have been landed. Closing PR #42493 and removing active labels.

@Wenson Thank you very much for the super quick turnaround on this!

[EWS]

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.