[Webkit-unassigned] [Bug 177602] New: WebGL content is black after switching tabs

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=177602

            Bug ID: 177602
           Summary: WebGL content is black after switching tabs
           Product: WebKit
           Version: Safari 10
          Hardware: Macintosh
                OS: macOS 10.12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebGL
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: kdmitrenko at gmail.com
                CC: dino at apple.com

1. Open https://yandex.com/maps/213/moscow/?ncrnd=3459&ll=37.583335%2C55.733222&z=16&l=stv%2Csta&panorama%5Bpoint%5D=37.588440%2C55.733808&panorama%5Bdirection%5D=171.429911%2C-4.006784&panorama%5Bspan%5D=120.000000%2C75.351069
2. Drag panoramic image
3. Swtich tab
4. Return to the tab with Yandex.Maps
5. Player is black

That's a regression that was introduced in Safari 11 (same problem in TP). I wasn't able to isolate smaller test case:( Is there a way to debug this with internal WebKit tools?

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