set the width and height of iframe with percent

[Nati323]

hello , i have seen here: http://www.w3schools.com/tags/tag_iframe.asp, that you specified the value of width and height pixels, so i concluded that pixels yes percent no, its right? because when i do to iframe width="100%" its work (at chrome at least).dose its work in all browsers and all versions? its legal? if not , with css its possible?

 

edit:

now i see this : http://www.w3schools.com/tags/att_iframe_height.asp , and you wrote there that in html 5 % dosent work. what i can do?

Edited March 14, 2015 by Nati323

[Ingolme]

The width and height attributes use pixels as units, but you can use CSS to style it with percentages.

[Nati323]

you mean that i should do only this:

iframe {width: 100%;height: 100%;}

?