March 2004
Intermediate to advanced
528 pages
16h 33m
English
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Length Units
A lot of CSS properties, such as margins, depend on length measurements to properly display various page elements. It’s no surprise, then, that there are a number of ways to measure length in CSS.
All length units can be expressed as either positive or negative
numbers followed by a label (although some properties will accept
only positive numbers). You can also use real numbers—that is,
numbers with decimal fractions, such as 10.5 or 4.561. All length
units are followed by a two-letter abbreviation that represents the
actual unit of length being specified, such as in
(inches) or pt (points). The only exception to
this rule is a length of 0 (zero), which need not
be followed by a unit.
These length units are divided into two types: absolute length units and relative length units.
Absolute Length Units
We start with absolute units because they’re easiest to understand, despite the fact that they’re almost unusable in web design. The five types of absolute units are as follows:
- Inches (
in) As you might expect, this notation refers to the inches one finds on a ruler in the United States. (The fact that this unit is in the specification, given that almost the entire world uses the metric system, is an interesting insight into the pervasiveness of U.S. interests on the Internet—but let’s not get into virtual sociopolitical theory right now.)
- Centimeters (
cm) Refers to the centimeters that one finds on rulers the world over. There are 2.54 centimeters to an inch, and one ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.