Opera 4 and 5 meet XML

Small, nimble, not quite complete

The browser you pay for While Netscape and Microsoft attempted to build empires on free browsers, Opera built a much smaller browser (intended to fit on a floppy!) which let users surf the Web without getting in their way. Standards conformance has always been a key part of that story.
XML and WAP With version 4.0, Opera added XML support and polished their CSS capability (with the help of Hakon Wium Lie, one of the editors of CSS). They also became the first PC-based Web browser vendor to add explicit support for the XML vocabulary Wireless Markup Language (WML), a key part of the Wireless Application Protocol (WAP) standards for browsing from cell phones.
Viewing, but not scripting XML While the latest versions of Opera provide ECMAScript and Java support, DOM support is still on the way, not listed as a feature.