Chrome extension and history.onVisited event -

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UI, and every time a particular web page visits, it displays a warning dialog

I was trying with the following code without any results:

manifest Json 

   
 background.html  
  & lt; html & Gt; & lt; top & gt; & lt; script & gt; Chrome.history.onVisited.addListener (function (HistoryItem result) {if (result.url == "http://my.url.com") {Warning ("my message");}});     
 
 This code What's wrong in? 
 
 Thanks

Take history out of the ceremony and You are OK: 

   gt; Top & gt; & lt; script & gt; Chrome.history.onVisited.addListener (function) {If (result.url == "http://my.url.com/") {Warning ("My Message");}}) & lt; / script & gt; & lt; / head & gt;

Also keep in mind that I've added slash to the end of "because the result will be removed."

< / Html>

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