[Webkit-unassigned] [Bug 191461] New: [css-flex][css-grid] Percentage sizes on elements inside the subitems should take into account the item's scrollbar size

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=191461

            Bug ID: 191461
           Summary: [css-flex][css-grid] Percentage sizes on elements
                    inside the subitems should take into account the
                    item's scrollbar size
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jfernandez at igalia.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 354323

  --> https://bugs.webkit.org/attachment.cgi?id=354323&action=review

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.

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