If you're wanting to disable mouse interaction, this should work.
Put a DIV over the top of your iframe, like so (replace top, left, width and height values with your own):
<div id="blank" style="display:none; position:absolute; top:100px; left:100px; width:600px; height:400px;">
I don't know if you can use the
disabled property like input elements, but you could disable mouse interaction by placing an element over the
iframe, though this doesn't stop a user from tabbing to it.
Probably the best bet is to set the
src attribute to blank, but this will make the
iframe blank, not blurred.
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