Full-screen iframe with a height of 100%

Question

Is iframe height=100% supported in all browsers?

I am using doctype as:

Answer 1

1. Change your DOCTYPE to something less strict. Don't use XHTML; it's silly. Just use the HTML 5 doctype and you're good:

2. You might need to make sure (depends on the browser) that the iframe's parent has a height. And its parent. And its parent. Etc:

html, body { height: 100%; }