How to disable text escape on xsl:copy-of - html

Question

I build a mechanism that takes all the <script /> tags and put them at the end of the page.
It works good except that Ampersant & characters are encode to & even those in JavaScript code which is not what I want.
How can I solve this?
XML
<?xml version="1.0" encoding="UTF-8"?>
<root></root>
XSLT
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0" xmlns="http://www.w3.org/1999/xhtml" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="html" />
<xsl:template match="*">
<xsl:variable name="body">
<xsl:apply-templates select="." mode="body"></xsl:apply-templates>
</xsl:variable>
<xsl:apply-templates select="$body" mode="no-script" />
<xsl:copy-of select="$body//script" xpath-default-namespace="http://www.w3.org/1999/xhtml" />
</xsl:template>
<xsl:template match="script" mode="no-script">
</xsl:template>
<xsl:template match="*[not(self::script)] | #* |comment()" mode="no-script">
<xsl:if test="name() != 'script'">
<xsl:copy xpath-default-namespace="http://www.w3.org/1999/xhtml">
<xsl:apply-templates select="node()[not(self::script)] | #*" mode="no-script" />
</xsl:copy>
</xsl:if>
</xsl:template>
<xsl:template match="*" mode="body">
<script type="text/javascript">
// Ampersand <xsl:text disable-output-escaping="yes"><![CDATA[&]]></xsl:text>
var a = 'a';
</script>
<div>Hello World</div>
</xsl:template>
</xsl:stylesheet>
It outputs:
<div xmlns="http://www.w3.org/1999/xhtml">Hello World</div>
<script xmlns="http://www.w3.org/1999/xhtml" type="text/javascript">
// Ampersand &
var a = 'a';
</script>
I tried and it works but I wunder if there is a way to keep the <script> tags inside the variable $body.
<script type="text/javascript">
<xsl:value-of select="$body//script" xpath-default-namespace="http://www.w3.org/1999/xhtml" disable-output-escaping='yes'/>
</script>

Answer 1

The HTML output method in XSLT 2.0+ should not perform escaping for the text within a script element.
However, there's a difference between 2.0 and 3.0. In 2.0, this only applies to a script element in no namespace. In 3.0, provided you're outputting HTML5, it also applies to a script element in the XHTML namespace.