[Webkit-unassigned] [Bug 257445] New: Pages going blank and locking

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=257445

            Bug ID: 257445
           Summary: Pages going blank and locking
           Product: WebKit
           Version: Safari 16
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jayboyd at gmail.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

I've put off reporting this but it's beginning to drive me crazy. 

This bug *definitely* began as soon as I updated my Mac to Ventura. I'm currently running 13.2.1. 

Most often this happens on Youtube, but I've occasionally seen it on other pages including my own web apps in progress. 

The behavior observed: I start playing a Youtube video. While playing, I switch tabs to Facebook (seems to be the #1 culprit), and scroll my feed. Often happens the instant I begin to scroll. The Youtube tab goes silent, and if I switch back to it, the entire page is black. Usually, but not always, if I try to refresh the page, it hangs, sometimes popping up a dialog saying the page is not responding, asking if I want to force reload. Often, but less than half the time, when the page reloads, the video is replaced with a message saying this video is not available. Another reload causes the video to load again. 

The alternate version, less common, has to do with apps I'm making that make heavy use of Canvas. When I tab away, again, to Facebook mostly, and come back to the app, every canvas on the page has been "erased" and is black (or transparent, can't determine). Other elements on the page remain. 

Whatever is going on here, it seems different tabs are not only competing for shared memory but are invalidating each other's memory space. 

I have not spent time in Chrome or Firefox to see if the behavior occurs there.

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