The <xsl:preserve-space> element defines the elements in the source document for which whitespace should be preserved. If there is more than one element, separate the names with a whitespace character. Preserving whitespace is the default setting, so this element only needs to be used to counteract an <xsl:strip-space> element.
<xsl:preserve-space elements=LIST-OF-ELEMENT-NAMES />
elementsNone.
Top-level, must be a child of <xsl:stylesheet> or <xsl:transform>.
XSLT, section 3.4
Supported.
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https://developer.mozilla.org/en-US/docs/Web/XSLT/preserve-space