[Webkit-unassigned] [Bug 220498] New: Stripe payment subframe contents missing sometimes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=220498

            Bug ID: 220498
           Summary: Stripe payment subframe contents missing sometimes
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Compositing
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com

>From bug 220231:

In Safari 13+ (and possibly earlier versions), a loaded iframe faded into view through a JavaScript based animation (e.g. `$.fadeIn()`) would sometimes paint blank. In those cases, no composite layer for the iframe would exist. Any reflow of the container would trigger the iframe paint. Applying a transform or other CSS style that would force a composite layer for the iframe would prevent the occurrence of this bug.

To reproduce:
- In Safari 13+ , open https://hofman-stripe-payments-demo.appspot.com/jq-repro/?stripeStaticLayer=false&stripeTransitionFix=false
- Click CB (the frame is painted correctly)
- Refresh
- Click CB again (make sure network cache is not disabled if devtools are open)
- Observe blank painted iframe where card input should be
- The iframe is actually functional, can be filed through keyboard or autofill.
- Any resize of the container (window) caused the iframe to be painted

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