Chromium Blog
News and developments from the open source browser project
Chrome 44 Beta: Improvements to Notifications API and promoted add to homescreen
2015年6月2日火曜日
The newest Chrome
Beta
channel release includes new ES6 features and a number of updates to existing APIs. Unless otherwise noted, changes described below apply to Chrome for Android, Windows, Mac, Linux and Chrome OS.
Improved notification capabilities
Chrome 42 allowed users to opt in to receive
push notifications
from sites even after the page is closed. Sites may now use
getNotifications
to observe which of their notifications are still being displayed, and
Notification.data
to store a payload with a notification so they can determine which notification was clicked.
Promoted add to homescreen improvements
Since Chrome 42, users who frequently visited a high-quality web app on Android saw a banner allowing them to
add the site to their home screen in one tap
. In this release Chrome fires a
cancellable
beforeinstallprompt
event before the banner is shown, allowing developers to
measure user interaction
with the feature. Developers are also now able to
offer the banner for their native Android app
.
ES6 computed property names
Until now, developers defining a JavaScript
object literal
needed to know the names of all of its properties before runtime. This release increase the expressiveness of the object literal syntax by providing support for
ES6 computed property names
, allowing developers to put an expression in brackets [], to be computed as the property name at runtime.
let propertyName = "foo";
let obj = {
[propertyName + "IsTrue"]: true,
contains: 12
};
Other updates in this release
Chrome’s implementation of the
Push API
has undergone
several minor breaking changes
in order to keep up to date with the evolving specification.
ES6
extended Unicode escape sequences
allow developers to use the extended set of Unicode characters in JavaScript string literals, where previously characters whose escape sequences contain more than four hexadecimal values were unable to be denoted.
This release includes a new implementation of
multi-column layout
by Opera engineer Morten Stenshorne, solving historic issues with incorrect column balancing.
Developers should now use the scroll attributes of
document.scrollingElement
instead of
document.body
as the latter has several
well known issues
.
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 Peter Beverloo, Software Engineer and Notification Newsmaker
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