Iframe transparent background

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I’ve used this creating an IFrame through Javascript and it worked for me:

// IFrame points to the IFrame element, obviously
IFrame.src="https://stackoverflow.com/questions/1234127/about: blank";
IFrame.style.backgroundColor = "transparent";
IFrame.frameBorder = "0";
IFrame.allowTransparency="true";

Not sure if it makes any difference, but I set those properties before adding the IFrame to the DOM.
After adding it to the DOM, I set its src to the real URL.

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