keywords were defined to map to a relatively common feature of font design in which a font is given nine levels of weight. OpenType, for example, employs a numeric scale with nine values. If a font has these levels built in, then the numbers are mapped directly to the predefined levels, with 100 as the lightest variant of the font, and 900 as the heaviest.

In fact, there is no intrinsic weight in these numbers. The CSS specification says only that each number corresponds to a weight at least as heavy as the number that precedes it. Thus,

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The other value, auto, allows for some even moreinteresting effects. It acts much the same as settingauto on margins, but in positioning, this canpermit the creation of elements that are only as wide or tall as theyneed to be in order to display their content, without having toexactly specify how high or wide that will be. We'll explorethis in detail later in the chapter as well.

It is important to remember that the side-offset properties define

Figure 8-51. Stacking the line boxes together

Then the top of the line box is placed against the bottom of the linebox for the preceding line. This will give us a paragraph as shown in Figure 8-52.

Figure 8-52. The final paragraph of stacked line boxes

As we can see, the middle line is taller than the other two, but itstill isn't big enough to contain the text within it.That's because the position of the inline boxes in the lineforces it to be taller than 12 pixels, but the line-box still