advanced iframe pro nulled is the most advanced iframe plugin for WordPress and also available as a standalone version. So why using this iframe plugin? There are many wrappers around but they all only do an include with no interaction with the main page and include the iframe like the original which most of the time leads to a result that is o.k. but not perfect
Resize the iframe to the content height or width on the same domain or if you are able to use the external workaround you can resize the iframe to the iframe height. Also dynamic size changes in the iframe are detected and even auto height of hidden elements is supported.