font-size-adjust property is used to specify font size by indirectly specifying the x-height of text. This property accepts three values: a number, none and inherit . This property was dropped from the CSS2.1 specification.
Example:
<p style="font-size: 40px;font-size-adjust: 0.55">the quick brown fox jumps over the lazy dog</p>
The x-height of the text will be
font size * font-size-adjust . Therefore, in the above example, the x-height will be 40px * 0.55 = 22px . However, depending on the font family, there might be a difference of one pixel.
This property can be used to ensure that when fallback font families are used, their appearance can be similar to the first choice font family.
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