The most common measurements used with style sheets are the percentage and the em-width, which we’ve already seen, and the pixel (px) and point (pt) which we haven’t. You should be very careful using static measurements such as pixels, points, and picas. They do not adjust themselves to the browser.
| % | a percentage of the element or an enclosing element, depending on context. |
|---|---|
| em | the height of the current font (upper-case characters) |
| ex | the height of the current font (lower-case characters) |
| mm | millimeters |
| cm | centimeters |
| in | inches |
| pc | picas: a pica is one sixth of an inch |
| pt | points: a point is 1/72nd of an inch |
| px | pixels |
When you use “0”, you don’t need to specify a measurement: zero is the same no matter what the measurement is.
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