[Webkit-unassigned] [Bug 280063] New: Regression (Safari 18.0): WordPress Classic Editor sidebar layout is broken (floats not clearing)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=280063

            Bug ID: 280063
           Summary: Regression (Safari 18.0): WordPress Classic Editor
                    sidebar layout is broken (floats not clearing)
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Keywords: InRadar
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: zalan at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Demo link to run WP classic editor in your browser: https://playground.wordpress.net/?plugin=classic-editor&blueprint-url=https://wordpress.org/plugins/wp-json/plugins/v1/plugin/classic-editor/blueprint.json?rev=3122271

Reproduction steps:
1. Click Screen Options
2. Enable Custom Fields and Discussion

In Safari 18 the new meta boxes are overlapping content on the right of the screen. In Safari 17 and other browsers they show below the post content as expected.

<rdar://136362683>

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