| Tests that the Performance wrapper stays alive for as long as its frame. |
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| On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". |
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| PASS window.performance.__proto__ is Performance.prototype |
| PASS window.performance.customProperty is undefined. |
| window.performance.customProperty = 1 |
| PASS window.performance.customProperty is 1 |
| PASS window.performance.customProperty is 1 |
| PASS window.performance.customProperty is 1 |
| PASS window.performance.customProperty is 1 |
| PASS successfullyParsed is true |
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| TEST COMPLETE |
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