i have 4 years experience with psd to html and psd to wordpress, so i'm master bootstrap, scss, less, angular, jquery, greenshock, php, html, html5, css3, foundation, wordpress, grunt...
i build html by grunt with yeoman so i just create modules for html and css, js. code very clear and optimize.
i understand how ie8, ie9,10,11, firefox,google chrome, safari... work, i can fix any bug with any browser and i understand viewport of any device as iphone,ipad, ipod, android devices so i can make design view very good in thier screens.
i used svg img and Font Awesome Icons so images will very good on retina screen.