index.md

---

title: <xsl:when>
slug: Web/XSLT/Element/when

---

{{ XsltRef() }}

The <xsl:when> element always appears within an <xsl:choose> element, acting like a case statement.

Syntax

<xsl:when test=EXPRESSION>
  TEMPLATE
</xsl:when>

Required Attributes

• test

  • : Specifies a boolean expression to be evaluated. If true, the contents of the element are processed; if false, they are ignored.

Optional Attributes

None.

Type

Subinstruction, always appears within an <xsl:choose> element.

Defined

XSLT, section 9.2.

Gecko support

Supported.