The Opera Dragonfly can debug JavaScript code and can be used to inspect DOM (Document Object Modules), CSS (Cascading Style Sheets) and HTTP network packets. It includes a console that highlights errors, and a command line.

With the JavaScript debugger, developers can monitor specific variables or isolate the activity of a specific expression. The network inspector can be used to debug a slow-loading Web page, observing resources as they are downloaded.

In addition to JavaScript and associated Ajax technologies, the debugger also covers HTML5 and related next-generation standards such as SVG (Scalable Vector Graphics).

Dragonfly 1.0 can be enabled in the latest version, version 11.1, of the Opera browser.

The IDG News Service