you are welcome and It's should work for all latest major browsers or just after you update your website and uploaded your website to your server go to this site http://www.responsinator.com/ and copy and paste / type your site domain to
Enter your site box and check it out how your side will look alike on all other devices .

There are few tools available to designers and developers today that ease the process of cross-browser testing on line. Few of my favorites are:
http://browsershots.org/
http://www.browsera.com/
http://www.lunascape.tv/

Browser Compatibility Check for Internet Explorer Versions from 5.5 to 10 :
http://www.my-debugbar.com/wiki/IETester/HomePage

Why Cross-Browser Testing is an Important Part of The Quality Control (QC)
http://www.wsol.com/why-cross-browser-t … art-of-qc/

Google map use iframe tag, it's little different but concept it same.

But recently I found a couple of tools and one of them which I really like it is Google Map Builder which it produced different code. (Based on JavaScript code)
have a look at following link
http://googlemapbuilder.mynameisdonald.com/

If you really concern about Cross-Browser compatibility, for alternative method you might like to add normalize.css to your projects.

about-normalize-css
http://nicolasgallagher.com/about-normalize-css/

Download
http://necolas.github.io/normalize.css/

and learn how?
http://www.youtube.com/watch?v=XQMX7k0XZeE