)</tt>
        isn't directly related to the dimension of the generated glyph
        bitmaps!</p>

        <p>Rather, the character size is indeed the size of <em>an abstract
        square</em>, called the <em>EM</em>, used by typographers to design
        fonts.  Scaling two distinct fonts to the same character size, be it
        expressed in points or pixels, generally results in bitmaps with
        <em>distinct dimensions</em>!</p>

        <p>Note that historically, the EM corresponded to the width