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Thursday, April 4, 2013

Chrome 27 Beta: A Speedier Web and New HTML5 Forms

Today we launched Chrome 27 on the Beta channel. This release introduces smarter behind-the-scenes resource scheduling and a few new features for web developers. Unless otherwise noted, updates apply to desktop versions of Chrome and Chrome for Android.

Faster page loads

Web content now appears on screen 5% faster (on average) thanks to changes in Chrome’s resource scheduler. Starting with this release, the scheduler is more aggressive about using an idle connection and demoting the priority of preloaded resources so that they don’t interfere with critical assets. We’ve also added Speed Index values from webpagetest.org to the list of metrics we use to measure improvements in page load time.

Elegant HTML5 date and time <input> forms

The month, week, and date <input> types now feature a simple, elegant user interface on desktop versions of Chrome, as shown in these screenshots from the datalist demo page:


Live audio input to Web Audio API

Starting in today’s Beta, you can use live audio as input to the Web Audio API for extremely low-latency local audio manipulation and playback. When combined with the recent hook up of Web Audio and WebRTC PeerConnection, it enables analysis and manipulation of the input signal to WebRTC. For now this feature is only available on Mac and Windows.

Sync FileSystem API for Chrome Apps

The Sync FileSystem API is a new offline storage API for Chrome Packaged Apps which automatically synchronizes stored data across clients via Google Drive. The files are stored in private sandboxes and can be manipulated with the HTML5 File API and FileSystem API. To play with the code, check out the API spec and syncfs-editor sample app.

DevTools updates

Dock-to-right supports vertical split view, and you can now right-click resources in the Network tab to “Copy as cURL”. The network panel has been improved as well: you can now customize what columns are shown, including the new “domain” one. Finally, console messages can be filtered by source and impl-side painting events are properly displayed in the timeline.

Other web platform features in this release
  • Unprefixed support for the allowfullscreen attribute for <iframe> allows embedded video players like YouTube’s to go fullscreen.
  • The User-Agent field is now sent in WebSocket opening handshake headers.
  • The ch CSS unit can be used to match the width and spacing of the "0"-glyph in the current font.
  • The 'X-Content-Type-Options: nosniff' HTTP response header now blocks script that's served with a content type other than one of the few we recognize as executable.
Visit chromestatus.com for a complete overview of Chrome’s developer features, and circle +Google Chrome Developers for more frequent updates.

Posted by Kinuko Yasuda, Software Engineer and Super Sync-er