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The Wayback Machine - https://web.archive.org/web/20180725050656/https://blog.chromium.org/2014/08/
Chromium Blog
News and developments from the open source browser project
Chrome 38 Beta: New primitives for the next-generation web
Thursday, August 28, 2014
Today’s Chrome
Beta
channel release includes a ton of new primitives and APIs to simplify development and give developers more control over their web applications. Unless otherwise noted, changes described below apply to Chrome for Android, Windows, Mac, Linux, and Chrome OS.
New HTML element: <picture>
This release adds support for the new
<picture> element
thanks to the hard work of community contributor
Yoav Weiss
, who was able to dedicate his time to implementing this feature in multiple rendering engines because of a
successful crowdfunding campaign
that raised 50% more than its funding goal.
The <picture> element takes the concept of
responsive design
, previously solved by sending duplicate resources to the client, and bakes an elegant solution right into the web platform. It allows developers to list multiple versions of images that may be appropriate for the browser to display based on screen size, pixel density, or other factors.
<picture>
<source media="(min-width: 45em)" srcset="large.jpg">
<source media="(min-width: 32em)" srcset="med.jpg">
<img src="small.jpg" alt="The president giving an award.">
</picture>
New JavaScript features
Chrome 38 also enables by default several new JavaScript language features from the draft
ECMAScript 6 (ES6) specification
. Additions include:
Maps and sets
, two highly-requested data structures which make storing and interacting with data simpler and more rational.
Iterators now provide an easy and extensible
way to iterate over sequenced data types
such as arrays and strings, as well as the new maps and sets.
Symbols
, which help prevent object properties from unintentionally interfering with each other.
Math functions such as Math.sign and Math.log10, which prevents developers from having to re-implement these functions and provides the performance boost of built-in functions. Take a look at the
full list of new functions
.
Future releases of Chrome will contain even more ES6 features as the specification matures. Stay posted!
Other updates in this release
The
Network Information ("NetInfo") API
is now enabled, giving web applications access to the current type of network on a device running Android, iOS, or Chrome OS. This could allow an app to only do data-intensive activities such as syncing when connected to a Wi-Fi connection.
The addition of the
Screen Orientation API
allows developers to not only detect whether a device is in portrait or landscape mode, but also lock the screen orientation while a user is within that app.
The CSS value
"image-rendering: pixelated"
is now supported, which allows scaled images to appear to be composed of very large pixels. Example use cases include high-performance display of zoomed photos in image editing software without large bandwidth or load time costs.
The Encoding API enables the encoding and decoding of data from binary streams, such as
converting between a raw ArrayBuffer and a string
.
The new
File interface
allows developers to create and interact with File objects in the same way as Blob objects.
SVG fonts are no longer supported, except on Windows systems older than Windows 7. Note that while the feature works on those systems, it is considered deprecated.
As always, visit
chromestatus.com/features
for a complete overview of Chrome’s developer features, and circle
+Google Chrome Developers
for more frequent updates!
Update January 26th: "image-rendering: pixelated" has been delayed until Chrome 41.
Posted by Andreas Rossberg, Senior Symbolic Software Engineer
Mac Chrome: When I’m Sixty-Four (Bits)
Thursday, August 28, 2014
On the heels of Tuesday’s release of
64-bit Chrome for Windows
, all Mac Chrome users on the
beta channel
will be updated to a new 64-bit version of Chrome 38. Previously, Chrome was a 32-bit app on Macs. While doubling the number of bits won’t make things twice as good, it does allow us to make a number of speed and security improvements.
64-bit Chrome has become faster as a result of having access to a superior instruction set, more registers, and a more efficient function calling convention. Improved opportunities for
ASLR
enhance this version’s security. Another major benefit of this change comes from the fact that most programs on a modern Mac are already 64-bit apps. In cases where Chrome was the last remaining 32-bit app, there were launch-time and memory-footprint penalties as 32-bit copies of all of the system libraries needed to be loaded to support Chrome. Now that Chrome’s a 64-bit app too, we expect you’ll find that it launches more quickly and that overall system memory use decreases.
Because of this change, Chrome for Mac will no longer support 32-bit
NPAPI
plugins, although their 64-bit counterparts are supported. Users shouldn’t notice any changes, because most major plugins are available in both 32-bit and 64-bit form, and many major websites have been switching from NPAPI towards more modern
HTML5 APIs
. This is also a good time to remind everyone that
NPAPI support will be removed from Chrome
later this year.
Nearly every Mac user has a computer capable of running this 64-bit version, so we’re automatically updating all Mac Chrome beta channel users. Those few users with first-generation Intel Macs will miss out on the fun, but as we bid them farewell, we’ll remind them that they’ll still be able to run the latest version on the
stable channel
,
Chrome 37
.
You can check to see if the Chrome you’re running is a 64-bit version by checking Chrome’s About page (chrome://help) and looking next to the version number. If it says “64-bit” there, that’s a sure sign that you’re running one of these new builds. We hope that this is the only visible difference that you’ll find between the old 32-bit and new 64-bit versions, but in case you find anything amiss during the beta period, please
let us know
.
Posted by Mark Mentovai, Software Engineer and Register Doubler
64 bits of awesome: 64-bit Windows Support, now in Stable!
Tuesday, August 26, 2014
Today, after a successful experiment with Chrome 64-bit Windows in our Dev and Canary channels in
June
, 64-bit Windows support is coming to Chrome Stable with the release of Chrome 37.
64-bit Chrome offers many benefits for speed, stability and security. Our measurements have shown that the native 64-bit version of Chrome has improved speed on many of our graphics and media benchmarks. For example, the VP9 codec that’s used in High Definition YouTube videos shows a 15% improvement in decoding performance. Stability measurements from people opted into our Canary, Dev and Beta 64-bit channels confirm that 64-bit rendering engines are almost twice as stable as 32-bit engines when handling typical web content. Finally, on 64-bit, our
defense in depth
security mitigations such as
Partition Alloc
are able to far more effectively defend against vulnerabilities that rely on controlling the memory layout of objects.
At this point 64-bit will remain opt-in, so to take advantage of the improvements click on the new “Windows 64-bit” link on the Chrome
download page
. Currently, the only significant
known issue
is the lack of 32-bit NPAPI plugin support. The 32-bit channel will remain fully supported for the foreseeable future and we will continue to support 32-bit plugins until NPAPI is
removed
from Chrome.
We encourage you to give 64-bit Chrome a try. We’re looking forward to hearing your
feedback
so we can continue to make Chrome the fastest, most secure and stable browser.
Posted by Will Harris,
Software Engineer and Embiggener of Bits
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