Standards support

Mozilla Firefox supports many software standards, including HTML, XML, XHTML, CSS, ECMAScript (JavaScript), DOM, MathML, DTD, XSLT, XPath, and PNG images with alpha transparency.[21] In addition Firefox supports the SVG standard, however what exists in the current stable version should only be treated as a "technology preview", as it is not a full implementation.[22] Firefox also supports standards proposals created by the WHATWG such as the offline storage[23][24] and canvas element.[25] Although Firefox 2 does not pass the Acid2 standards-compliance test, development builds of Firefox 3 pass the test.[26]