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| PASS The top browsing context can only show one payment sheet at a time. |
| PASS If an iframe shows a payment request, the top-level browsing context can't also show one. |
| PASS An iframe cannot show a payment request if the top-level window is already showing one. |
| PASS Given multiple nested browsing contexts, and window calls show() first, other nested browsing contexts can't show a request. |
| PASS Given multiple nested browsing contexts, and an iframe calls show() first, other nested browsing contexts can't show a request. |
| PASS Navigating an iframe as a nested browsing context sets 'payment request is showing boolean' to false. |
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