I’ve coded to varying extents in the following languages:

• ActionScript (Adobe Flash)
• Apache Directives
• C++
• Content Security Policy and related micro‐vocabularies such as CORS, HSTS, and Referrer Policy
• CSS
• ECMAScript (JavaScript) and DOM vocabularies such as CSSOM, CSSOM View, DOM (formerly as DOM Core, DOM Events, DOM HTML, DOM Style, DOM Traversal and Range, Element Traversal, Selectors API, etc.), DOM Parsing and Serialization, HTML Canvas, regular expressions, SVG, UI Events, URL, XMLHttpRequest and application‐specific vocabularies for Mozilla Firefox and Mozilla Thunderbird extensions
• HTML as SGML, HTML, XHTML, and XHTML‐as‐HTML
• Java
• PHP and PHP regular expressions
• SGML and SGML DTDs (as HTML and XML)
• SVG
• XML and minor XML vocabularies such as XML DTD, XLink, XML Namespaces, xml-stylesheet, xml:id, and xml:space
• XUL for both Mozilla Firefox and Mozilla Thunderbird extensions
• XSLT and XPath