CONSOLE MESSAGE: First visit.
CONSOLE MESSAGE: Visited fragment and waited.
This test checks that interrupting a slow navigation with a fragment navigation will cancel the first navigation.

============== Back Forward List ==============
        http://127.0.0.1:8000/navigation/navigation-interrupted-by-fragment.html  **nav target**
curr->  http://127.0.0.1:8000/navigation/navigation-interrupted-by-fragment.html#abc  **nav target**
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