Chromium Blog
News and developments from the open source browser project
Chrome 27 Beta: A Speedier Web and New HTML5 Forms
2013年4月4日木曜日
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
Blink: A rendering engine for the Chromium project
2013年4月3日水曜日
WebKit
is a lightweight yet powerful rendering engine that emerged out of
KHTML
in 2001. Its flexibility, performance and thoughtful design made it the obvious choice for Chromium's
rendering engine
back when we started. Thanks to the hard work by all in the community, WebKit has thrived and kept pace with the web platform’s growing capabilities since then.
However, Chromium uses a different
multi-process architecture
than other WebKit-based browsers, and supporting multiple architectures over the years has led to increasing complexity for both the WebKit and Chromium projects. This has slowed down the collective pace of innovation - so today, we are introducing
Blink
, a new open source rendering engine based on WebKit.
This was not an easy decision. We know that the introduction of a new rendering engine can have significant implications for the web. Nevertheless, we believe that having multiple rendering engines—similar to having multiple browsers—will spur innovation and over time improve the health of the entire open web ecosystem.
In the short term, Blink will bring little change for web developers. The bulk of the initial work will focus on internal architectural improvements and a simplification of the codebase. For example, we anticipate that we’ll be able to remove 7 build systems and delete more than 7,000 files—comprising more than 4.5 million lines—right off the bat. Over the long term a healthier codebase leads to more stability and fewer bugs.
Throughout this transition, we’ll collaborate closely with other browser vendors to move the web forward and preserve the compatibility that made it a successful ecosystem. In that spirit, we’ve set
strong guidelines for new features
that emphasize standards, interoperability, conformance testing and transparency.
To learn more about Blink visit our
project page
.
Posted by Adam Barth, Software Engineer
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