Bug 191461

Summary: [css-flex][css-grid] Percentage sizes on elements inside the subitems should take into account the item's scrollbar size
Product: WebKit Reporter: Javier Fernandez <jfernandez>
Component: Layout and RenderingAssignee: Nobody <webkit-unassigned>
Status: NEW    
Severity: Normal CC: bfulgham, chu, jfernandez, rego, simon.fraser, svillar, zalan
Priority: P2    
Version: WebKit Nightly Build   
Hardware: Unspecified   
OS: Unspecified   
See Also: https://bugs.chromium.org/p/chromium/issues/detail?id=836827
Bug Depends on: 217479    
Bug Blocks:    
Attachments:
Description Flags
Test case to reproduce the flexibe box issue
none
Test case to reproduce the grid box issue none

Javier Fernandez
Reported 2018-11-09 03:49:28 PST
Created attachment 354323 [details] Test case to reproduce the flexibe box issue Check the attached examples, the issue is more noticeable in Grid Layout but it also happens on Flexbox. The problem is that the items have a child with 100% width and height. The items also have margin, padding, border and scrollbar. The scrollbar size is ignored so the items end up being bigger than expected, causing overflow (so you can actually scroll) when it was supposed to not happen.
Attachments
Test case to reproduce the flexibe box issue (1.49 KB, text/html)
2018-11-09 03:49 PST, Javier Fernandez 		no flags
Details
Test case to reproduce the grid box issue (1.46 KB, text/html)
2018-11-09 03:49 PST, Javier Fernandez 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Javier Fernandez
Comment 1 2018-11-09 03:49:54 PST
Created attachment 354324 [details] Test case to reproduce the grid box issue
Takeru Chuganji
Comment 2 2025-10-19 00:30:30 PDT
I was not able to identify the issue with the attachment, but I found another piece of code that reproduces it possibly related to this. https://codesandbox.io/p/sandbox/ydlskv
Takeru Chuganji
Comment 3 2025-10-19 06:01:56 PDT
Pull request: https://github.com/WebKit/WebKit/pull/52626
Note You need to log in before you can comment on or make changes to this bug.