Chromium Blog
News and developments from the open source browser project
Chrome 34 Beta: Responsive Images and Unprefixed Web Audio
Thursday, February 27, 2014
Today’s
Chrome Beta
channel release introduces a new HTML attribute for
responsive images
and the unprefixed version of the JavaScript Web Audio API. Unless otherwise noted, changes apply to desktop versions of Chrome and Chrome for Android.
The srcset attribute
Today the web is used on laptops, TVs, phones, tablets and
other
devices with heterogeneous screen sizes and
device pixel ratios
. Serving the same image resources to all devices can lead to slower page load times, wasted bandwidth and improperly formatted content.
srcset
will help resolve this problem by letting Web developers provide multiple resources in varying resolutions for a single image. The browser can then pick the resource that matches the device's capabilities. Here’s an example of the code:
<img alt="A rad wolf." src="pic1x.jpg" srcset="pic1x.jpg 1x, pic2x.jpg 2x, pic4x.jpg 4x">
Note that the src attribute is not needed for browsers that support
srcset
, but it’s good for backwards compatibility. Kudos to external Blink developer
Yoav Weiss
for implementing and driving consensus for this feature. Stay tuned for
the <picture> element
, which will also help web developers with responsive design.
Unprefixed Web Audio
The
Web Audio API
is a high-level JavaScript API for processing and synthesizing audio in web applications. We shipped the prefixed version of the API a few years ago. Starting with this release, the unprefixed API entry points
audioContext
and
offlineAudioContext
will be available in addition to their prefixed counterparts. Legacy methods such as
createGainNode
and
createDelayNode
are deprecated.
This brings Chrome’s implementation of Web Audio in alignment with the
W3C draft specification
and offers compatibility with the Web Audio support in Firefox. Please switch to the unprefixed versions soon, as the prefixed versions are now officially deprecated and will be removed in a future release.
UPDATE April, 9th: Unprefixed Web Audio will ship in Chrome 35, not Chrome 34.
Other web platform changes in this release
The
font-variant-ligatures CSS property
allows developers to control
ligatures
in text.
A variety of infrequently used web platform features have been deprecated or removed. For a complete list, see the list of
Blink “intents”
.
As we’ve
previously discussed
, Chrome will now offer to remember and fill password fields in the presence of
autocomplete=off
. This change does not affect non-password fields.
If you’ve ever been curious about the usage of HTML and JavaScript features, check out the updated
chromestatus.com/metrics
, which now shows the percentage of page loads that use certain web platform features.
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 Raymond Toy, Software Engineer and Audiofile [sic]
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