Opera Dragonfly alpha 2

Opera Dragonfly - Take a peek into the future

Welcome to Opera Dragonfly alpha 2, the foundations of Opera’s upcoming Developer Tools. Debug JavaScript, inspect CSS and the DOM, and view any errors—Opera Dragonfly makes developing using Opera easier than ever, both on your computer and mobile phone. Check out our second alpha release for increased stability and newly added features. Opera Dragonfly is included in Opera 9.5 and above, and can be activated by clicking Tools → Advanced → Developer Tools in the menu bar.

New to alpha 2

We’ve listened to your feedback to make Opera Dragonfly even better. New features for alpha 2 include Command Line auto-complete, CSS editing, docked window mode, a debug menu, as well as many bug and stability fixes.

Reach breaking point step by step

Opera Dragonfly's fully featured JavaScript debugger makes building sophisticated Ajax applications easier than ever. Step through your code line by line, setting break points along the way. This allows you to make sure your application and scripts are acting as you designed them.

Debug the DOM

View source isn’t much use if you use DOM Scripting to alter the DOM. Opera Dragonfly allows you to inspect the updated DOM and all its properties. Support for editing the DOM will be added in an upcoming version.

Redefine your style

It’s not just the DOM you can inspect. Check out what CSS rules apply to which element, and what rules are inherited or set by browser defaults. Overridden rules are highlighted so you can see what styles are or aren't applied. Alpha 2 introduces CSS debugging to tweak existing properties and values, as well as a handy auto-complete feature to make editing faster and more convenient.

Spot your errors

An improved error console allows you to see, filter and log any errors in your scripts, pointing to the exact position where the error occurred. Use this in combination with the other tools to hunt down and fix your site’s bugs.

Think open and free

Built using the open web standards you know and love, Opera Dragonfly’s source is available to view. Not only that, but it is released on a open source BSD license, meaning it is free as in freedom as well as in beer.

Always up to date

Opera Dragonfly is a new breed of hybrid application. Part desktop application, part web application, it is stored in local persistent storage, yet instantly updates when a new version is released—just like your favorite web sites. You never have to check for updates or install a new version.

Debug your phone or TV

Debug pages whether they are on your computer or a supported device, such as a phone running Opera Mobile 9.5 for Windows Mobile. You can connect to any device running Core-2.1 or above, and debug using your computer’s screen and keyboard—no need to struggle inputting test data with your phone’s keypad again.

The Opera debug menu

Alpha 2 introduces a new debug menu for download. This allows Opera Dragonfly to be opened more conveniently, and groups together the existing Opera 9.5 features that are useful to web developers in one place.

Coming soon

The second alpha release is the next step towards Opera Dragonfly 1.0. Look forward to new features such as DOM editing, improved JavaScript thread handling, XHR and HTTP monitoring, improved keyboard navigation, and translation into a number of languages in subsequent releases.