Opera 20 released
Opera 20 for Mac and Windows (based on Chromium 33) is out! Here’s what that means for web developers.
Opera 20 supports the Web Components / Custom Elements spec by default. This means you can use
document.registerElement() to register custom elements, and
document.createElement(elementName, typeExtension) to instantiate type extension-style custom elements. See this Custom Elements tutorial for more information.
Unprefixed Page Visibility API
You can now use
document.hidden instead of
document.webkitHidden and listen for
visibilitychange event rather than the
More extension APIs
Opera 20 for Desktop adds the following APIs to extensions:
See our Opera 15+ extensions documentation for in-depth discussion of these APIs.
If you’re interested in experimenting with features that are in the pipeline for future versions of Opera, we recommend following our Opera Developer stream.