Show Only One Beforeunload Dialog

third_party/blink/web_tests/fast/loader/show-only-one-beforeunload-dialog.html

150.0.7829.2327 B

This page registers a 'beforeunload' handler, and contains multiple IFrames that each do the same. Only the initial dialog from this top-level frame should display. The IFrame dialogs should be suppressed.

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