How to pass XSL variable into HTML tags

We all know that to consume an XSL variable with other XSL tag we just prefix it with dollar ($). But how about passing the variable to HTML tags? The answer: just enclosed it with curly braces ( {} ).

 <xsl:variable name="someVar" select="'some value'"/>

<xsl:value-of select="$someVar" /> 

<div id="{$someVar}"> 

some others...  

</div>