Chromium Blog
News and developments from the open source browser project
Chrome 43 Beta: Web MIDI and upgrading legacy sites to HTTPS
2015年4月16日木曜日
The newest Chrome
Beta
channel release includes Web MIDI support, new features to improve security and compatibility and a number of small changes to enable developers to build more powerful web applications. Unless otherwise noted, changes described below apply to Chrome for Android, Windows, Mac, Linux and Chrome OS.
Connecting to MIDI devices from the web
MIDI is a well-established communication protocol used by music devices such as synthesizers, DJ decks, and drum machines. In Chrome 43, users are able to use MIDI hardware to create music without installing any specialized software, as the
Web MIDI API
allows websites to communicate with connected MIDI devices such as a USB-MIDI drum machine plugged into an Android tablet.
Permissions API
Until now, websites have been unable to determine the permission state of APIs such as
Geolocation
. Due to this, sites often attempt to use APIs immediately after page load without pre-existing permission, causing users to see confusing permission prompts with no context or explanation.
The new
Permissions API
allows developers to query and observe changes to their permission status for
Geolocation
,
Push
,
Notifications
and
Web MIDI
so they can ask for permission in context, improving the user experience.
Moving DOM attributes to the prototype chain
In Chrome 43, attributes defined on DOM objects have been
moved to the prototype chain
, as specified by
Web IDL
. This change allows developers to efficiently override or create methods on DOM Objects and improves compatibility with Firefox and Internet Explorer. As this subtle change may cause breakages in existing content, developers should use Chrome 43 to
test their website
to ensure their users don’t experience issues when this release rolls out to all users.
Upgrading legacy sites to HTTPS
Transitioning large collections of unmodifiable legacy web content to encrypted, authenticated HTTPS connections can be challenging as the content frequently includes links to insecure resources, triggering mixed content warnings. This release includes a new CSP directive,
upgrade-insecure-resources
, that causes Chrome to upgrade insecure resource requests to HTTPS before fetching them. This change allows developers to serve their hard-to-update legacy content via HTTPS more easily, improving security for their users.
Other updates in this release
The
Cache Storage API
, previously only available in
service workers
, now provides developers full
imperative control over their caching
in the page context.
The
autocapitalize
property is
now supported
on
input
and
textarea
elements, allowing sites to suggest default capitalization for text typed with on-screen keyboards.
Developers can now
programmatically trigger copy and cut actions
using
document.execCommand('copy')
and
document.execCommand('cut')
in response to a user gesture, eliminating the need to use Flash-based workarounds.
The
Fetch API
now allows developers to directly operate on and incrementally release the bytes of
streamed network responses
, in contrast to the equivalent
XMLHttpRequest
functionality that requires developers keep the entire in-progress stream response in memory.
showModalDialog
was
disabled by default in Chrome 37
and in accordance with the public deprecation timeline, this release removes the Enterprise Policy setting created to temporarily re-enable it.
Chrome OS now fires
devicemotion
events on pages at a regular interval, allowing developers to track the device’s acceleration in the same way they do on Chrome for Android, Windows, Mac, and Linux.
The
Web Audio API
now allows developers to
selectively disconnect
specific connections to an
AudioNode
or
AudioParam
, avoiding the audio artifacts caused by disconnecting all inputs and then manually re-connecting those that should have been retained.
Developers using the
Web Audio API
can now also
explicitly close
an
AudioContext
, releasing all allocated system audio resources instead of depending on unpredictable garbage collection.
The nonstandard WebSocket.URL and EventSource.URL were removed in favor of their standard counterparts WebSocket.url and EventSource.url.
CSS animations can now be used without the
-webkit
prefix.
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 Takashi Toyoshima, Software Engineer and MIDI Music Maker
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