<xsl:fallback>
XSLT/XPath Reference: XSLT elements, EXSLT functions, XPath functions, XPath axesThe <xsl:fallback>
element specifies what template to use if a given extension (or, eventually, newer version) element is not supported.
Syntax
<xsl:fallback> TEMPLATE </xsl:fallback>
Required Attributes
None.
Optional Attributes
None.
Type
Instruction, appears within a template.
Defined
XSLT, section 15
Gecko support
Not supported at this time.
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https://developer.mozilla.org/en-US/docs/Web/XSLT/Element/fallback