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Ok. I don't really know how specifc is your case.

If you want some link that opens an external site (of another origin) into a specific <iframe>, then you just need add the name attribute to your frame, then add the target attribute to the link anchor (<a>) with the name you defined your frame with.

Run the following snippet to see it working:

iframe
{
  border: 1px solid red;
}

<iframe name="myFrame"></iframe>
<div>
  <a href="https://www.stackoverflow.com/" target="myFrame">CLICK HERE</a>
</div>

PS.: I don't know why the frame is refusing to load the link though.

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