Developer tip

Avoiding pixel and absolute measures allows the browser to adapt content to fit the display. An exception to rule is where an image has been specifically sized for a particular display. In this case references to the image in markup may specify the exact dimensions of the image in pixels, in order to help the browser to flow the page and avoid re-flowing it after the page has been retrieved. Devices may realize the intentions of authors more accurately if margins, borders and padding are specified in pixels.

Use percentage and relative measures such as em, ex, bolder, larger and thick.