<acronym>HTML
</acronym> has gone through a number of versions. The
<acronym>XML
</acronym>-compliant version described here is called
<acronym>XHTML
</acronym>. The latest widespread version is
<acronym>XHTML
</acronym> 1.0, available in both
<emphasis>strict
</emphasis> and
<emphasis>transitional
</emphasis> variants.