In CSS, “px” is not an angular measurement and it is not non-linear[1]<p><a href="http://omnicognate.wordpress.com/2013/01/07/in-css-px-is-not-an-angular-measurement-and-it-is-not-non-linear/" rel="nofollow">http://omnicognate.wordpress.com/2013/01/07/in-css-px-is-not...</a>