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FONT-SIZE-ADJUST

The FONT-SIZE-ADJUST property gives Web authors control over the legibility of the font displayed. It effectively extends the functionality of the FONT-SIZE property, by addressing an inherent problem with specifying font sizes: not all font sizes are equal. A courier font set to 12 points does not take up the same space on screen as 12 point Times Roman, 12 point Helvetica or just about any other font. You can see this illustrated in Figure 23-2, which uses a number of different fonts all set to the same point size.

This is primarily due to the different aspect values of various fonts, which is the value of the size of the font divided by its x-height. While fonts of the same point size may have a different display size, fonts of the same aspect value appear to have the same size. FONT-SIZE-ADJUST enables Web authors to set the aspect value for the fonts on a Web page, so that they all appear with the same legibility, as Figure 23-3 depicts.


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