lfs-book/stylesheets/lfs-xsl/docbook-xsl-1.78.1/params/make.graphic.viewport.xml

<refentry xmlns="http://docbook.org/ns/docbook"
          xmlns:xlink="http://www.w3.org/1999/xlink"
          xmlns:xi="http://www.w3.org/2001/XInclude"
          xmlns:src="http://nwalsh.com/xmlns/litprog/fragment"
          xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
          version="5.0" xml:id="make.graphic.viewport">
<refmeta>
<refentrytitle>make.graphic.viewport</refentrytitle>
<refmiscinfo class="other" otherclass="datatype">boolean</refmiscinfo>
</refmeta>
<refnamediv>
<refname>make.graphic.viewport</refname>
<refpurpose>Use tables in HTML to make viewports for graphics</refpurpose>
</refnamediv>

<refsynopsisdiv>
<src:fragment xml:id="make.graphic.viewport.frag">
<xsl:param name="make.graphic.viewport" select="1"/>
</src:fragment>
</refsynopsisdiv>

<refsection><info><title>Description</title></info>

<para>The HTML <tag>img</tag> element only supports the notion
of content-area scaling; it doesn't support the distinction between a
content-area and a viewport-area, so we have to make some compromises.</para>

<para>If <parameter>make.graphic.viewport</parameter> is non-zero, a table
will be used to frame the image. This creates an effective viewport-area.
</para>

<para>Tables and alignment don't work together, so this parameter is ignored
if alignment is specified on an image.</para>
</refsection>
</refentry>