May 2000
Intermediate to advanced
472 pages
14h 17m
English
Content preview from Cascading Style Sheets: The Definitive GuideBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Font Size
The methods for determining font size are both very familiar and very different.
In a fashion very similar to the font-weight
keywords bolder and lighter,
the property font-size
has relative-size keywords called larger and
smaller. Much as we saw with relative font
weights, these keywords cause the computed value of
font-size to move up and down a scale of absolute
values, which we’ll need to understand before we can explore
larger and smaller. First,
though, we need to explore how fonts are sized in the first place.
In fact, the relation of the font-size property to
what you actually see rendered is determined by the font’s
designer. This relationship is set as an em
square
(some call it an em
box) within the font itself. This em square, and thus the font size,
doesn’t have to refer to any boundaries established by the
characters in a font themselves. Instead, it refers to the distance
between baselines when the font is set without any extra leading
(line-height in CSS). It is quite possible for
fonts to have characters that are taller than the default distance
between baselines. For that matter, a font might be defined such that
all of its characters are smaller than its em square. Some
hypothetical examples are shown in Figure ...
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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.