javascript - Open URL in same window from different tabs -

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Assume that a javascript on my web page contains this function that loads the URL from the text file with the id URL Is: 

  function loadUrl () {var url = document.getElementById ('url'). Values; window.open (url, 'urlwindow'); }   
 If I open two tabs in my browser and open my web page in both tabs, then I want both tabs to open the URL in a single window, two different Do not have windows. Is this possible?  
 In other words, I want to target opening a window from another tab.   
 
 
 You can not control the user's browser behavior: just add it as the target window "_blank "And hope your user has a web client recently that opens a new tab and there is no new window.

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