XSLT

XSLT (Extensible Stylesheet Language Transformations, also XSL(T) or XSL-T), is a domain-specific declarative programming language that transforms text into text. It was originally designed for transforming XML documents into other XML documents, or other formats such as HTML for web pages, plain text, or XSL Formatting Objects. These formats can be subsequently converted to formats such as PDF, PostScript, and PNG. Support for JSON and plain-text transformation was added in later updates to the XSLT 1.0 specification. XSLT 3.0 implementations support Java, .NET, C/C++, Python, PHP and NodeJS. An XSLT 3.0 JavaScript library can also be hosted within the web browser. Modern web browsers also include native support for XSLT 1.0. However usage has always been rather low and declining. It was used by 0.02% of websites in 2013 and 0.001% in 2025. Over the years XSLT repeatedly had severe security vulnerabilities. Therefore, Google planned to remove it from Chromium in 2013 and 2015. Now Chromium, Firefox and WebKit plan on removing native XSLT support to make the browser more secure by the end of 2026. Today a Polyfill can be used to support even newer versions of XSLT without native support. The XSLT document transformation specifies how to transform an XML document into new document (usually XML, but other formats, such as plain text are supported). Typically, input documents are XML files, but anything from which the processor can build an XQuery and XPath Data Model can be used, such as relational database tables or geographical information systems. While XSLT was originally designed as a special-purpose language for XML transformation, the language is Turing-complete, making it theoretically capable of arbitrary computations. XSLT is often ambiguously referred to as XSL. This is due to XSL-FO using XSLT, the initial XSLT-only mimetype text/xsl, the more common filename extension .xsl and xsl:...