[Webkit-unassigned] [Bug 255022] New: [css-grid] grid-template-rows: masonry has an effect, even when the feature is turned off

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=255022

            Bug ID: 255022
           Summary: [css-grid] grid-template-rows: masonry has an effect,
                    even when the feature is turned off
           Product: WebKit
           Version: Safari 16
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: klerud at gmail.com

Affects Safari 16.4 and Technical Preview 166.

With the experimental feature CSS Masonry Layout turned OFF, when grid-template-rows: masonry is present, the grid is laid out with a masonry effect. `@supports (grid-template-rows: masonry)` matches as well.

The masonry layout has some issues that break certain layouts, so this seemingly accidental introduction of the feature is a bit unfortunate.

Demo: https://codesandbox.io/s/festive-moon-n16ycr?file=/src/styles.css:40-79

In Safari 16.4 with the CSS Masonry Layout experimental feature turned OFF, I would expect not to see the text "This browsesr supports masonry".

Firefox behaves correctly, only showing the text when the feature flag is turned on.

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