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By Ian Haynes
We can cover a range of device sizes with CSS3 media queries and typically do so using % or ems (or rems) for font sizing and test for the device width in pixels. This can give issues with browser zoom modes however, and a solution is to use ems for the media queries too, rather than pixels, as this blog post by Lyza Gardner explains: http://blog.cloudfour.com/the-ems-have-it-proportional-media-queries-ftw/.
Ian is a front end/back end developer currently focusing on HTML5/CSS3 and mobile responsive design. He's a regular poster on the Expression Forums and Gallery.