IE9 does support vw & vh units http://snook.ca/archives/html_and_css/vm-vh-units viewport measurements viewport relative dimensions http://snook.ca/archives/html_and_css/vm-vh-units http://snook.ca/archives/html_and_css/vm-vh-units Sizing With CSS3′S VW and VH Units Sizing with CSS3′s vw and vh units – Snook.ca Sizing with CSS3’s vm and vh units - Snook.ca Jonathan Snook Sizing with CSS3's vw and vh units Sizing with CSS3′s vw and vh units Sizing with CSS3′s vw and vh units Sizing with CSS3′s vw and vh units – Snook.ca Sizing with CSS3’s vm and vh units - Snook.ca Sizing with CSS3's vw and vh Units Sizing with CSS3′s vw and vh units Sizing with CSS3’s VW and VH units Sizing with CSS3's vw and vh Units Sizing With CSS3′S VW and VH Units