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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