[Webkit-unassigned] [Bug 187545] New: JavaScript mouseover events triggered when app is in background

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=187545

            Bug ID: 187545
           Summary: JavaScript mouseover events triggered when app is in
                    background
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Macintosh
                OS: macOS 10.13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: opendarwin at lapcatsoftware.com

Steps to reproduce:
1. Open Safari on macOS
2. Open https://github.com/WebKit/webkit
3. Hover mouse over table rows, notice that background color changes
4. Open TextEdit, making it the active app, leaving Safari window in the background
5. Move mouse out of TextEdit window and over Safari window

Expected results: Table row background color does not change on hover

Actual results: Table row background color does change on hover

Notes:

* These are JavaScript mouseover events. Disable JavaScript to see that the background color stops changing entirely.

* This behavior does not occur in Firefox or Google Chrome.

* When Safari is in the background, web sites should not be able to capture mouse events. This basically allows sites to spy on user activity. You may be moving your mouse across the screen for any reason and just accidentally cross the Safari window.

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