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Dev Opera is a community resource site where developers can share tips, tricks, extensions and more. This is the place where ideas are born, so contribute today! More in the forums...

Debugging widgets using Opera Dragonfly and the Opera Widget Emulator

By Hans S. Tømmerholt · 1 Oct, 2008

Debugging Opera widgets is a breeze if you use Opera Dragonfly together with the Widget emulator. This article shows you how.

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Automatic numbering with CSS Counters

By David Storey · 1 Oct, 2008

In this article David Storey looks at how to use CSS counters to provide robust sequential numbering for reoccuring HTML elements such as list items or paragraphs.

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Presto 2.1 - web standards supported by Opera’s core

By Bruce Lawson · 10 Sep, 2008

This article details the standards support provided by Opera's Presto 2.1 rendering engine.

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Opera Binary Markup Language

By Chris Mills · 10 Sep, 2008

In this article Chris Mills gives the lowdown on OBML, the one of the main technologies behind Opera Mini, which is also available in the Opera Devices SDK 9.6.

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Opera Devices SDK 9.6 developer documentation

By David Storey · 10 Sep, 2008

The Opera Devices SDK 9.6 is now available, allowing device manufacturers to build custom browser solutions for any devices they wish on top of Opera core technologies. In this article, David Storey explores what features are available in the new SDK.

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