Remove the Extra Whitespace Surrounding Iframes?

Question

I am using iframes in my page, and have stumbled across a weird issue. I set the iframe css like so

iframe {
    margin: none;
    padding: none;
    background:         


        

Answer 1

Since none of the given answers provided a solution for me (I also stumbled across the weird margin issue when implementing an iFrame) I found this to be working fine:

marginwidth and marginheight are not valid / officially supported HTML5-tags but they work just fine in my tests...