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39 lines
1.3 KiB
39 lines
1.3 KiB
<refentry id="nominal.image.width">
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<refmeta>
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<refentrytitle>nominal.image.width</refentrytitle>
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<refmiscinfo role="type">length</refmiscinfo>
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</refmeta>
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<refnamediv>
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<refname>nominal.image.width</refname>
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<refpurpose>The nominal image width</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<src:fragment id='nominal.image.width.frag'>
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<xsl:param name="nominal.image.width" select="6 * $pixels.per.inch"/>
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</src:fragment>
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</refsynopsisdiv>
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<refsect1><title>Description</title>
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<para>Graphic widths expressed as a percentage are problematic. In the
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following discussion, we speak of width and contentwidth, but
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the same issues apply to depth and contentdepth.</para>
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<para>A width of 50% means "half of the available space for the image."
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That's fine. But note that in HTML, this is a dynamic property and
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the image size will vary if the browser window is resized.</para>
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<para>A contentwidth of 50% means "half of the actual image width".
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But what does that mean if the stylesheets cannot assess the image's
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actual size? Treating this as a width of 50% is one possibility, but
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it produces behavior (dynamic scaling) that seems entirely out of
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character with the meaning.</para>
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<para>Instead, the stylesheets define a
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<parameter>nominal.image.width</parameter> and convert percentages to
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actual values based on that nominal size.</para>
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</refsect1>
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</refentry>
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