Bug 161880 - With a WKWebView's scroll view, a negative content offset y value is reset to 0 if the web view's frame height is increased.
Summary: With a WKWebView's scroll view, a negative content offset y value is reset to...
Status: NEW
Alias: None
Product: WebKit
Classification: Unclassified
Component: New Bugs (show other bugs)
Version: WebKit Nightly Build
Hardware: iPhone / iPad iOS 9.3
: P2 Normal
Assignee: Nobody
URL:
Keywords: InRadar
Depends on:
Blocks:
 
Reported: 2016-09-12 15:56 PDT by gchatz
Modified: 2016-09-12 21:22 PDT (History)
2 users (show)

See Also:

Attachments
Test app (27.61 KB, application/zip)
2016-09-12 15:56 PDT, gchatz 		no flags Details
View All Add an attachment (proposed patch, testcase, etc.)

Note You need to log in before you can comment on or make changes to this bug.
Description gchatz 2016-09-12 15:56:31 PDT 
Created attachment 288628 [details]
Test app

Summary:
With a WKWebView's scroll view, a negative content offset y value is reset to 0 if the web view's frame height is increased.

Steps to Reproduce:
1. Set content offset of a WKWebView to a negative value.
2. Set the WKWebView's height to a bigger value.
3. Observe the new content offset of the web view.
(See test app)

Expected Results:
The content offset should stay negative.

Actual Results:
The content offset is changed to 0.

Version:
Since at least iOS 9. Present in iOS 10.

Configuration:
iPhones and iPads