javascript - only open child webpage if it is no longer open or the url changed to a different site? -

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i not want webpage reload if open, causes unnecessary data sent javascript application.

if webpage not open, want open. if webpage open user used teh tab load webpage, want new webpage open,.

if webpage open , still on right url, not want change, not want refresh.

however can not seem find way know if url changed.

i can use cookies if have rather not. suggestions? thanks.


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