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This patch introduces a test that simulates the steps outlined in bug 1897631 to reproduce a crash caused by the absence of the parent global object. The parent object goes away when the page is refreshed, while there are pending encoder or decoder output callbacks queued for execution. In such cases, when these output callbacks are executed, they fail to create the necessary WebCodecs elements due to lack of the required parent global objects. Those objects were removed during the page reload. However, one drawback of using a page refresh in the test is that it doesn't guarantee the crash will occur 100% of the time. There is a slight chance the test will pass by luck. Nevertheless, having a test that works 90% of the time is better than having no test at all. Differential Revision: https://phabricator.services.mozilla.com/D211470
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