<h1>Understanding the difference between EM, PX, %age and PT<br> - <a href="http://aamirshahzad.net">Aamir Shahzad</a></h1> <p>Let's understand Pixel's philosophy by a jsfiddle coding example. Resize output window to check <b>PX</b> in action.</p>
body { font-family: calibri, arial; font-size: 14px; } h1 { font-size: 48px; } h1 a { text-decoration: none; } h3 { font-size: 36px; } p { font-size: 24px; } @media (min-width:768px) and (max-width: 1024px) { h1 { font-size: 36px; } h3 { font-size: 28px; } p { font-size: 18px; } } @media(max-width: 768px) { h1 { font-size: 28px; } h3 { font-size: 24px; } p { font-size: 14px; } }