javascript - AngularJS {{}} placeholder Not Working Within Iframe Tag -

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I'm a stranger in a strange country ....

In my source, why does This: 

  Video URL: {{Exercise. Deployed [0] .url}}   
 Working by showing the URL for the video ... but: < / P>   & lt; Iframe src = "http://fast.wistia.net/embed/iframe/{{exercise.videos[k].url}}" & gt; & Lt; / Iframe & gt;   
 Only '{{exercise.videos [0] .url}}' and does not have the same information as the other?  
  
 
 
 Because  src  has not been evaluated by AngularJS but  Ng-source is :  
  & lt; Iframe ng- src = "http://fast.wistia.net/embed/iframe/{{exercise.videos [0] .url}}" & gt; & Lt; / Iframe & gt;

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