Chromium Blog
News and developments from the open source browser project
Chrome 40 Beta: Powerful Offline and Lightspeed Loading with Service Workers
2014年12月4日木曜日
The newest Chrome
Beta
channel release includes several new developer features to help you make richer, more compelling web content and apps, especially for mobile devices. Unless otherwise noted, changes described below apply to Chrome for Android, Windows, Mac, Linux, and Chrome OS.
Service Workers
This release adds
service workers
, a powerful new API that allows developers to make sites work offline by intercepting network requests to deliver programmatic or cached responses. Besides enabling a rich offline experience, developers can also use the API to achieve dramatic performance improvements by caching UI and other common resources between page loads.
A before and after comparison of a repeat visitor loading a site that uses Service Workers.
Unlike other web technologies, the lifetime of a service worker is independent of the page that installed it. This lays the foundation for a new class of web applications with rich background capabilities. For example, future APIs like
Push
and
Background Sync
could do their work even after the page is closed, provided the user has given permission.
This release includes two new APIs for use only within service workers. The
Fetch API
allows service workers to make network requests—including cross-origin—and return the responses to pages they control. The
Cache API
can save fetched responses and then return them directly the next time the same resource is requested, bypassing the latency-prone network and the eviction-prone HTTP cache.
These APIs are still under active development and we are committed to keeping our implementation in sync with the specifications as they evolve. This release supports a subset of the Cache API, but developers can use a
polyfill
for full compatibility. If you’re interested in more in-depth information, check out
HTML5 Rocks
or our
collection
of useful service worker “recipes.”
Other updates in this release
This release brings support for
the new directives
introduced in Content Security Policy (CSP) Level 2.
The new
reportValidity
method causes Chrome to draw the user’s attention to form fields with
validation
errors, saving developers from needing to implement this feature manually in JavaScript.
Chrome now supports the
minlength attribute
, a
validation
feature that allows developers to declare a lower bound on the number of characters a user can input.
Thanks to a collaboration with
Intel's Open Source Technology Center
, Chrome on Mac now uses
HarfBuzz
for text shaping which improves performance and rendering of non-Latin text, brings new optimizations, and unifies the font system across all platforms.
Developers can use the
theme-color meta tag
to customize their toolbar color in the
app switcher
on Android Lollipop.
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 Dominic Cooney and Joshua Bell, Software Engineers at your service
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