Google Chrome is a web browser built with open source code and
developed by Google.
The name is derived from the graphical user interface frame, or "chrome", of
web browsers. Chromium is
the name of the open source project behind Google Chrome, released under the
A beta version for Microsoft Windows was released on 2 September 2008 in
The release announcement was originally scheduled for 3 September 2008,
and a comic by Scott McCloud was to be sent to journalists and bloggers
explaining the features of and motivations for the new browser.
Copies intended for Europe were shipped early and German blogger Philipp
Lenssen of Google Blogoscoped
made a scanned copy of the 38-page comic available on his website after
receiving it on 1 September 2008.
Google subsequently made the comic available on Google Books and their site
and mentioned it on its official blog along with an explanation for the
Top Features of Google Chrome
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A beta version for Microsoft Windows (XP and later only) was released on
2 September 2008 in 43 languages. Mac OS X and Linux versions are under
An unofficial workaround for use with Windows 2000, is also available.
On 3 September, a Slashdot news item
drew attention to a passage in the terms of service for the initial beta
release, which seemed to grant to Google a license to all content
transferred via the Chrome browser.
The passage in question was inherited from the general Google terms of
service. The Register
summarized the passage as "Your copyright goes up in smoke."
On the same day, Google responded to this criticism by stating that the
language used was borrowed from other products, and removed the passage in
question from the Terms of Service.
Google noted that this change would "apply retroactively to all users who
have downloaded Google Chrome."
The first release of Google Chrome passed the Acid1 and Acid2 tests.
While it has not yet passed the Acid3 test, Google Chrome scores
78/100—higher than both Internet Explorer 7 (14/100) and Firefox 3 (71/100),
but lower than Opera's 84/100.
When compared to equivalent "preview" or beta builds, Chrome scores lower
than Firefox (85/100), Opera (91/100), and Safari (100/100), but still
higher than Internet Explorer (21/100).
||September 2, 2008 (2008-09-02)
||0.2.149.29 (September 5,
2008 (2008-09-05)) [+/−]
||Microsoft Windows (XP and Vista)
||BSD license (source code and Chromium executable),
Google Chrome Terms of Service (Google Chrome executable)
Primary design goals were improvements in security, speed, and stability
compared to existing browsers. There also were extensive changes in the user
Chrome was assembled from 26 different code libraries from Google and others
from third parties such as Netscape.
Chrome periodically downloads updates of two blacklists (one for phishing
and one for malware), and warns users when they attempt to visit a harmful
site. This service also is made available for use by others via a free
public API called "Google Safe Browsing API". In the process of maintaining
these blacklists, Google also notifies the owners of listed sites who may
not be aware of the presence of the harmful software.
Chrome will typically allocate each tab to fit into its own process to
"prevent malware from installing itself" or "using what happens in one tab
to affect what happens in another", however the actual process allocation
model is more complex.
Following the principle of least privilege, each process is stripped of its
rights and can compute, but can not write files or read from sensitive areas
(e.g. documents, desktop)—this is similar to "Protected Mode" that is used
by Internet Explorer 7 on Windows Vista. The Sandbox Team is said to
have "taken this existing process boundary and made it into a jail";
for example, malicious software running in one tab is unable to sniff credit
card numbers, interact with the mouse, or tell "Windows to run an executable
on start-up" and it will be terminated when the tab is closed. This enforces
a simple computer security model whereby there are two levels of multilevel
security (user and sandbox) and the sandbox can only
respond to communication requests initiated by the user.
Typically, Plugins such as Adobe Flash Player are not standardized and as
such, cannot be sandboxed as tabs can be. These often need to run at, or
above, the security level of the browser itself. To reduce exposure to
attack, plug-ins are run in separate processes that communicate with the
renderer, itself operating at "very low privileges" in dedicated per-tab
processes. Plugins will need to be modified to operate within this software
architecture while following the principle of least privilege.
Chrome supports the Netscape Plugin Application Programming Interface
but does not support the embedding of ActiveX controls.
Also, Chrome does not have an extension system such as Mozilla's XPInstall
architecture. Java applets
support is available in Chrome as part of the pending Java 6 update 10,
which currently is in Release Candidate testing.
A private browsing feature called Incognito mode is provided as
well. It prevents the browser from storing any history information or
cookies from the websites visited. This is similar to the private browsing
feature available in Apple's Safari and the latest beta version of Internet
project to be split off (as was Adobe/Mozilla's Tamarin) and handled by a
separate team in Denmark. Existing implementations were designed "for small
programs, where the performance and interactivity of the system weren't that
important", but web applications such as Gmail "are using the web browser to
transitions, dynamic code generation, and precise garbage
Tests by Google show that V8 is about twice as fast as Firefox 3 and the
Safari 4 beta.
Several websites have performed benchmark tests using the SunSpider
intense benchmarks, which includes ray tracing and constraint solving.
They unanimously report that Chrome performs much faster than all
competitors against which it has been tested, including Safari, Firefox 3,
Internet Explorer 7, and Internet Explorer 8.
While Opera has not been compared to Chrome yet, in previous tests, it has
been shown to be slightly slower than Firefox 3, which in turn, is slower
Another blog post by Mozilla developer, Brendan Eich, comparing the
results, states that some tests are faster in one engine and some are faster
in the other. John Resig,
different browsers on Google's own suite, finding Chrome "decimating" other
browsers, but he questions whether Google's suite is representative of real
programs. He states that Firefox performs poorly on recursion intensive
benchmarks, such as those of Google, because the Mozilla team has not
implemented recursion-tracing yet.
The Gears team was considering a multithreaded browser (noting that a
problem with existing web browser implementations was that they are
inherently single-threaded) and Chrome implemented this concept with a
similar to Loosely Coupled Internet Explorer (LCIE) recently
implemented by Internet Explorer 8.
By default, a separate process is allocated to each site instance and
plugin. This prevents
tasks from interfering with each other, which is good for security and
stability; an attacker successfully gaining access to one application does
not gain access to all, and failure in one application results in a Sad Tab
screen of death, similar to the well-known Sad Mac. This strategy exacts a
fixed per-process cost up front, but results in less memory bloat overall as
fragmentation is confined to each process and no longer results in further
Chrome features a process management utility called the Task Manager
which allows the user to "see what sites are using the most memory,
downloading the most bytes and abusing [their] CPU" (as well as the plugins
which run in separate processes) and terminate them.
The main user interface includes back, forward, refresh, bookmark, go,
and cancel options. The options are similar to Safari, while the location of
the settings is similar to versions of Internet Explorer starting with
version 7. The design of the minimize, maximize, and close window buttons
are based on Windows Vista.
When the window is not maximized, the tab bar appears directly under the
title bar. When maximized, the title bar disappears, and instead, the tab
bar is shown at the very top of the window. Unlike other browsers such as
Internet Explorer or Firefox which also have a full-screen mode that hides
the operating system's interface completely, Chrome can only be maximized
like a standard Windows application. Therefore, the Windows task bar, system
tray, and start menu link still take space at all times unless they have
been configured to hide at all times.
Chrome includes Gears, which adds developer features that may, or may
not, become web standards, typically relating to the building of web
applications (including offline support).
Chrome replaces the browser home page which is displayed when a new tab
is created with a New Tab Page. This shows
thumbnails of the nine most visited web sites along with the sites most
often searched, recent bookmarks, and recently closed tabs.
The Omnibox is the URL box at the top of each tab, which combines
the functionalities of both URL box and search box. It includes autocomplete
functionality, but only will autocomplete URLs that were manually entered
(rather than all links), search suggestions, top pages (previously visited),
popular pages (unvisited), and text search over history. Search engines also
can be captured by the browser when used via the native user interface by
Popup windows "are scoped to the tab they came from" and will not appear
outside the tab unless the user explicitly drags them out.
Popup windows do not run in their own process.
Chrome uses the WebKit rendering engine to display web pages, on advice
from the Android team.
Like most browsers, Chrome was extensively tested internally before release
with unit testing, "automated user interface testing of scripted user
actions" and fuzz testing, as well as WebKit's layout tests (99% of which
Chrome is claimed to have passed). New browser builds are automatically
tested against tens of thousands of commonly accessed websites inside of the
Google index within 20-30 minutes.
Tabs are the primary component of Chrome's user interface and as such,
have been moved to the top of the window rather than below the controls.
This subtle change contrasts with many existing tabbed browsers which are
based on windows and contain tabs. Tabs (including their state) can be
transferred seamlessly between window containers by dragging. Each tab has
its own set of controls, including the Omnibox.
Chrome allows users to make local desktop shortcuts that open web
applications in the browser. The browser, when opened in this way, contains
none of the regular interface except for the title bar, so as not to
"interrupt anything the user is trying to do." This allows web applications
to run alongside local software (similar to Mozilla Prism and Fluid).
By default, the status bar is hidden whenever it is not being used.
However, it appears at the bottom left corner whenever a page is loading and
when a hyperlink is hovered over.
The Daily Telegraph's Matthew Moore summarizes the verdict of early
reviewers: "Google Chrome is attractive, fast and has some impressive new
features, but may not—yet—be a threat to its Microsoft rival."
Microsoft reportedly "played down the threat from Chrome" and "predicted
that most people will embrace Internet Explorer 8."
Opera Software said that "Chrome will strengthen the Web as the biggest
application platform in the world."
Mozilla said that Chrome's introduction into the web browser market comes as
"no real surprise", that "Chrome is not aimed at competing with Firefox", —
and furthermore, should not affect Google's financing of Firefox.
Chrome’s design bridges the gap between desktop and so-called “cloud
computing.” At the touch of a button, Chrome lets you make a
desktop, Start menu, or Quick Launch shortcut to any Web page or Web
application, blurring the line between what’s online and what’s
inside your PC. For example, I created a desktop shortcut for Google
Maps. When you create a shortcut for a Web application, Chrome
strips away all of the toolbars and tabs from the window, leaving
you with something that feels much more like a desktop application
than like a Web application or page.
—PC World 
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