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There are several issues that are tricky due to asynchronous, thread-based processing in browsers
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This is seen when reloading JavaScript pages, which sometimes produces unclear results since different frames and variables are set in a different order from that in which multi-frame system was built!
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Often get "false" errors as variables not set "in time"
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Note that when you set a location field in a window with a JavaScript command such as:
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window.location = "newurl";
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subsequent commands are executed immediately and do not wait wait for the new page to be loaded!
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