Chromium Blog
News and developments from the open source browser project
Chrome 48 Beta: Present to Cast, custom notification buttons, and network estimation
2015年12月3日木曜日
Unless otherwise noted, changes described below apply to the newest Chrome
Beta
channel release for Android, Chrome OS, Linux, Mac, and Windows.
Presentation API
Historically, sites have been unable to present content to nearby devices, which made
it hard to build experiences like a slide “presenter mode”
for the mobile web. The latest release of Chrome on Android now allows mobile sites to
present to Google Cast devices
using the standards-based
Presentation API
and the
Cast Web SDK
.
Custom buttons on notifications
Chrome 42
introduced
the ability for users to receive push notifications from websites, allowing users to build deeper relationships with the sites they love. Usage of the feature has grown quickly, with Chrome now delivering more than
350 million push notifications every day
. In the latest Chrome release, sites can now add
custom buttons to notifications
, enabling users to complete tasks
entirely within the notification
.
Notification actions in Chrome 48 on Android
Detecting maximum connection speed
A user’s mobile phone connects to the internet over anything from high quality WiFi to 2G, which has made it difficult to design the right mobile experience. Developers can now use
NetworkInformation.downlinkMax
to
detect a device's maximum bandwidth
so they can send the optimal resources for the connection speed. Sites can also respond to changes in connection quality using the
NetworkInformation.onChange
event handler.
Other features in this release
The new DevTools security panel enables developers to understand the security state of a page to help them migrate their websites to HTTPS.
Sites can now use
FontFaceSet
more flexibly with several new
iteration methods
.
WebRTC
now supports the
VP9 video codec
, and can serve HD video at almost
half the bandwidth of VP8 or H264
.
Web Audio
JavaScript syntax can now be
shortened and simplified
with method chaining for
AudioNode.connect()
and
AudioParam.connect()
automation methods.
The
MediaStreamTrack.remote
attribute allows sites to detect if a media stream is from a remote source.
Sites can now detect key presses from a user without worrying about browser type or operating system using the
KeyboardEvent.code
attribute.
Developers can now leverage JavaScript language behaviors not previously exposed in ES5 or below using the
well-known symbols
@@isConcatSpreadable, @@toPrimitive.
min-width:auto
and
min-height:auto
now work for
flex items
without
flex-basis:auto
.
Several
getAll()
methods have been added to
IndexedDB
to simplify bulk interactions.
Minor changes
ServiceWorkerRegistration.update()
no longer bypasses the cache for update checks within 24 hours, improving spec compliance.
The error attribute on
IDBRequest
and
IDBTransaction
will now return
DOMException
instead of
DOMError
to improve Chrome's spec compliance.
The
RC4 cipher
is no longer supported over HTTPS connections due to
several vulnerabilities
.
The
MediaStreamTrack.getSources()
method has been deprecated in favor of
MediaDevices.enumerateDevices()
.
SVGGraphicsElement.getTransformToElement has been removed to match the SVG
spec
.
getSVGDocument() has been removed from HTMLFrameElement.prototype to match the
spec
.
SVG
glyph-orientation-horizontal
and
glyph-orientation-vertical
properties have been removed in favor of the CSS
text-orientation
property.
SVGElement.offset*
properties and
SVGPathSeg
interfaces have been removed to improve spec compliance.
The CSS
plus-darker composite operator
has been removed to increase
spec
compliance.
The item() method has been removed from
TextTrackList
and
TextTrackCueList
to improve spec compliance.
Developers can now build robust RTL text experiences using
CSS Writing Modes Level 3
without prefixes.
CSS
font-feature-settings
are no longer prefixed.
Posted by Anton Vayvod, Presentation MC
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