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Google Chrome 0.2.149.29 Beta
08.09.2008, 16:28
Google
Chrome веб-браузер производства Google с открытым исходным кодом,
сочетающий поддержку веб-приложения и удобный поиск с высокой скоростью
и стабильностью. В Chrome использованы наработки Apple WebKit и Mozilla
Firefox. Из особенностей Chrome разработчики особо выделяют
изолированные вкладки, предотвращающие сбой работы программы и
обеспечиваюющие более надежную защиту от опасных сайтов. Кроме этого, в
Chrome реализован новый движок JavaScript V8, который позволит браузеру
работать с веб-приложениями нового поколения.
Security • Sandboxing Every
tab in Chrome is sandboxed, so that a tab can display contents of a web
page and accept user input, but it will not be able to read the user's
desktop or personal files. Google say they have "taken the existing
process boundary- and made it into a jail". There is an exception to
this rule; browser plugins such as Adobe Flash Player do not run within
the boundaries of the tab jail, and so users will still be vulnerable
to cross-browser exploits based on plugins, until plugins have been
updated to work with the new Chrome security. Google has also developed
a new phishing blacklist, which will be built into Chrome, as well as
made available via a separate public API. • Privacy Google
announces a so-called incognito mode claiming that it "lets you browse
the web in complete privacy because it doesn’t record any of your
activity". No features of this, and no implications of the default mode
with respect to Google's database are given. • Speed Speed improvements are a primary design goal.
Stability • Multiprocessing The
Gears team were 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
multiprocessing architecture. A separate process is allocated to each
task (eg tabs, plugins), as is the case with modern operating systems.
This prevents tasks from interfering with each other which is good for
both security and stability; an attacker successfully gaining access to
one application does not give them access to all and failure in one
application results in a "Sad Tab" screen of death. 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 memory allocations. To complement this,
Chrome will also feature a process manager which will allow the user to
see how much memory and CPU each tab is using, as well as kill
unresponsive tabs.
User interface • Features Chrome has
added some commonly used plugin-specific features of other browsers
into the default package, such as an Incognito tab mode, where no logs
of the user activity are stored, and all cookies from the session are
discarded. As a part of Chrome's V8 JavaScript virtual machine, pop-up
JavaScript windows will not be shown by default, and will instead
appear as a small bar at the bottom of the interface until the user
wishes to display or hide the window. Chrome will include support for
web applications running alongside other local applications on the
computer. Tabs can be put in a web-app mode, where the omnibar and
controls will be hidden with the goal of allowing the user to use the
web-app without the browser "in the way". • Rendering Engine Chrome
uses the WebKit rendering engine on advice from the Gears team because
it is simple, memory efficient, useful on embedded devices and easy to
learn for new developers. • Tabs While all of the major tabbed
web browsers (e.g. Internet Explorer, Firefox) have been designed with
the window as the primary container, Chrome will put tabs first
(similar to Opera). The most immediate way this will show is in the
user interface: tabs will be at the top of the window, instead of below
the controls, as in the other major tabbed browsers. In Chrome, each
tab will be an individual process, and each will have its own browser
controls and address bar (dubbed omnibox), a design that adds stability
to the browser. If one tab fails only one process dies; the browser can
still be used as normal with the exception of the dead tab. Chrome will
also implement a New Tab Page which shows the nine most visited pages
in thumbnails, along with the most searched on sites, most recently
bookmarked sites, and most recently closed tabs, upon opening a new
tab, similar to Opera's "Speed Dial" page.
Головна 
