Chromium Blog
News and developments from the open source browser project
Chrome 45 Beta: New ES2015 features, service worker improvements, and media controls
2015年7月27日月曜日
The newest Chrome
Beta
channel release includes new JavaScript language features, an improved audio experience on Android, and a large number of minor API improvements and deprecations. Unless otherwise noted, changes described below apply to Chrome for Android, Windows, Mac, Linux, and Chrome OS.
New ES2015 features
Over the past year Chrome has shipped a number of new JavaScript features defined in the
ES2015
specification (formerly known as ES6), a major update to JavaScript that allows developers to write application logic that is easier to read, more powerful, and more memory efficient than ever before.
Chrome 45 includes a set of
new ES2015 features
including
arrow functions
,
new methods on
Array
,
new methods on
TypedArray
, and
Object.assign()
.
Service worker improvements
Chrome 40 introduced support for
service workers
, enabling developers to build high performance sites that work offline. This release includes a number of improvements:
Developers are now able to
measure their service worker’s performance
using the
User Timing
and
Resource Timing
APIs.
Service workers used exclusively to send
push notifications
are now kept up-to-date correctly and developers can also use the new
update
method to manually trigger an update check.
Sites can now use
getRegistrations()
to access all the service workers whose scope matches the current page.
Finally, in a breaking change, messages sent via
Client.postMessage()
now fire an event on
navigator.serviceWorker
instead of the
window
object.
Media controls in Android notifications
Playback controls for currently-playing audio are shown in the notification tray and on the lock screen
On Android, native apps can show media controls in a system notification when playing audio, making it easy for users to control audio while multitasking. Chrome 45 brings this capability to the web by showing a notification with media controls when audio is playing in web content. The
controls will automatically show up
when
<audio>
or
<video>
tags play audio longer than 5 seconds.
Other updates in this release
Sites
can now customize
the vibration triggered when showing a notification on Android.
Chrome’s implementation of the
Push API
has undergone
several minor breaking changes
to keep up to date with the evolving specification.
Sites using
promoted add to home screen
can now programmatically
control the timing
of the banner.
The
rotationAngle
attribute of
Touch
objects is no longer prefixed, making it easier for sites to
understand the geometry of the user's touch
with cross-browser code.
To improve scroll performance on pages with heavy mouse handlers or
:hover
styles, Chrome
no longer sends mouse position updates
when the user is scrolling with a trackpad or scrollwheel.
Chrome now immediately prefetches all
HTML imports
referenced by a page instead of waiting for scripts included higher in the document to finish executing, improving performance.
Sites can now include 3rd-party resources on their site with reduced security risk by
using a hash to ensure the integrity of 3rd-parties resources
.
To reduce the risk of certain types of attack, the
'self'
source defined by
Content Security Policy
now excludes
blob
and
filesystem
URLs.
The
logjam attack
is fixed in this release by deprecating the use of keys smaller than 1024 bits in Diffie-Hellman key exchanges, which may require developers to
update their server’s TLS configuration
.
To improve cross-browser compatibility and specification compliance,
CSSUnknownRule
and
CSSKeyframesRule.insertRule()
are now deprecated with the latter now replaced by
CSSKeyframesRule.appendRule()
.
Sites using
SMIL
will now trigger
deprecation
warnings in the console, encouraging them to migrate to
CSS Animations
and
Web Animations
.
This release deprecates both
multiple shadow roots
and
shadow-piercing deep selectors
following a unanimous decision by browser vendors at the
Web Components April 2015 meeting
.
The
MediaStream
attributes
label
and
ended
are
now deprecated
in favor of
id
and
active
, while the
stop()
method is deprecated in favor of
MediaStreamTrack.stop()
.
Update: The User Timing and Resource Timing APIs are unfortunately not exposed to service workers in this release, but should be available in Chrome 46.
As always, visit
chromestatus.com/features
for a complete overview of Chrome’s developer features, and circle
+Google Chrome Developers
for more frequent updates.
Posted by Andreas Rossberg, Software Engineer and ECMAScript Evangelizer
Exploring the Physical Web with Chrome for iOS
2015年7月22日水曜日
Today’s connected world is full of opportunities for people to digitally interact with their surroundings on the fly. For example, smart parking meters let users pay through the cloud. But for developers, it’s often difficult to build contextual experiences that people can easily access. Even with the prevalence of smartphones, users are reluctant to install an app or even type a URL while on the go.
The
Physical Web
is an open source approach to help you build contextual interactions that people can discover and use with less friction. A few months ago, Chrome for iOS added a
Today widget
to let users open a new tab or do a voice search right from the Notification Center. The new Chrome for iOS integrates the Physical Web into the Chrome Today widget, enabling users to access an on-demand list of web content that is relevant to their surroundings.
It’s easy to make your content discoverable via the Physical Web using Eddystone, an open Bluetooth Low Energy beacon format
announced
last week.
Eddystone
supports multiple frame types for different use cases. The Physical Web displays content that is broadcasted using
Eddystone-URL
, the beacon frame type designed to convey compressed URLs. You can add your content to the Physical Web by simply configuring a
beacon that supports Eddystone-URL
to transmit your URL of choice.
When users who have enabled the Physical Web open the Today view, the Chrome widget scans for broadcasted URLs and displays these results, using estimated proximity of the beacons to rank the content. You can learn more about the types of user experiences that the Physical Web enables by visiting our
cookbook
and joining the open source community on
GitHub
.
The new Chrome for iOS is an early exploration in enabling users to access the Physical Web in their day-to-day mobile experiences. As the ecosystem grows, we’ll continue to explore new ways to bring the Physical Web to users’ fingertips. We’re looking forward to seeing the new contextual experiences you’ll build.
Posted by Jake Leichtling, Physical Web Explorer
Revving up JavaScript performance with TurboFan
2015年7月7日火曜日
The JavaScript ecosystem is evolving in several promising ways. There have been mainstream standards advancements like the recent approval of
ECMAScript 2015
, as well as early-stage experiments like
Strong Mode
, to name a few. Balancing the needs of these new directions demands a flexible
just-in-time compiler
, and we've been hard at work on a brand new compiler for V8, codenamed "TurboFan." Since Chrome 41, TurboFan has been enabled for certain types of code, speeding up traditional content as well as improving performance for new language features.
TurboFan was built from the ground up with many unique capabilities in mind. It optimizes more code than the
previous optimizing compiler
, supports flexible and dynamic optimization modes, and enables easier contributions and maintenance. Thanks to these features and more, we've turned on TurboFan for some types of code that were challenging for our previous compiler to optimize, such as
asm.js
, class literals, with scopes, computed property names and for-of loops. TurboFan already shows promising performance results, including a 29% increase on the zlib score of the
Octane benchmark
.
Over the coming months, we expect to enable TurboFan for more and more types of JavaScript, with the eventual goal of entirely replacing our existing CrankShaft compiler. As it rolls out, developers' code will automatically get these free speedups with no changes needed. Stay tuned for future progress.
Posted by Ben L. Titzer, Software Engineer and TurboFan Mechanic
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