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‎docs/content/misc/faq.ngdoc

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#FAQ
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### Why is this project called "angular"? Why is the namespace called "ng"?
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### Why is this project called "AngularJS"? Why is the namespace called "ng"?
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Because HTML has angular brackets and "ng" sounds like "angular".
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Because HTML has Angular brackets and "ng" sounds like "Angular".
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### Is <angular/> an HTML5 tag?
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No, <angular/> is not an HTML5 tag. angular is an orthogonal project to HTML5; you can use the two
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together.
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### Is AngularJS a library, framework, plugin or a browser extension?
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### Is angular a {library, framework, DOM manipulation library, widget library, native plugin}?
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AngularJS fits the definition of a framework the best, even though it's much more lightweight than
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a typical framework and that's why many confuse it with a library.
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No, angular is none of these. You don't call its functions, it does not call your functions,
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it does not provide a way to manipulate DOM, but does provide primitives to create UI projections
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of your data. There are lots of existing widget libraries which you can integrate with angular.
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It is 100% JavaScript, 100% client side and compatible with both desktop and mobile browsers.
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AngularJS is 100% JavaScript, 100% client side and compatible with both desktop and mobile browsers.
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So it's definitely not a plugin or some other native browser extension.
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### Do I need to worry about security holes in angular?
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Like with any technology, angular is not impervious to attack. angular does, however, provide
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### Is AngularJS a templating system?
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At the highest level, Angular does look like a just another templating system. But there is one
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important reason why Angular templating system is different and makes it very good fit for
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application development: bidirectional data binding. The template is compiled in the browser and
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the compilation step produces a live view. This means you, the developers, don't need to write
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code to constantly sync the view with the model and the model with the view as in other
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templating systems.
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### Do I need to worry about security holes in AngularJS?
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Like with any technology, AngularJS is not impervious to attack. angular does, however, provide
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built-in protection from basic security holes including cross-site scripting and HTML injection
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attacks. angular does round-trip escaping on all strings for you.
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attacks. AngularJS does round-trip escaping on all strings for you and even offers XSRF protection
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for server-side communication.
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AngularJS was designed to be compatible with other security measures like Content Security Policy
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(CSP), HTTPS (SSL/TLS) and server-side authentication and authorization that greatly reduce the
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possible attack vectors and we highly recommended their use.
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### Can I download the source, build, and host the angular environment locally?
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### Can I download the source, build, and host the AngularJS environment locally?
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Yes. See instructions in {@link downloading}.
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### Is angular a templating system?
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At the highest level, angular does look like a just another templating system. But there is one
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important reason why angular templating system is different and makes it very good fit for
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application development: bidirectional data binding. The template is compiled on the browser and
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the compilation step produces a live view. This means you, the developer, don't need to write
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code to constantly sync the view with the model and the model with the view as in other
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templating systems.
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### What browsers does angular work with?
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Webkit-based browsers (Safari, Chrome, iPhone, Android, WebOS, BlackBerry 6), Firefox, IE6 and
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above. Note that CSS only works on IE7 and above.
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Our we run our extensive test suite against the following browsers: Safari, Chrome, Firefox, Opera,
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IE8, IE9 and mobile browsers (Android, Chrome Mobile, iOS Safari).
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### What's Angular's performance like?
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The startup time heavily depends on your network connection, state of the cache, browser used and
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available hardware, but typically we measure bootstrap time in tens or hundreds of milliseconds.
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### What's angular's performance like?
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The runtime performance will vary depending on the number and complexity of bindings on the page
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as well as the speed of your backend (for apps that fetch data from the backend). Just for an
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illustration we typically build snappy apps with hundreds or thousands of active bindings.
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angular takes ~300ms to load, render, and compile. In Chrome it uses about 2-5MB of memory. Your
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app's performance will vary depending on how many bindings you use.
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### How big is the angular bootstrap JS file that I need to include?
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### How big is the angular.js file that I need to include?
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The size of the file is < 29KB compressed and minified.
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The size of the library itself is < 50KB compressed and obfuscated.
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### Can I use the open-source Closure Library with angular?
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### Does angular use the jQuery library?
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Yes, angular uses {@link http://jquery.com/ jQuery}, the open source DOM manipulation library.
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If jQuery is not present in your script path, angular falls back on its own implementation of
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{@link api/angular.element jQuery lite}. If jQuery is present in the path, angular uses it to
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manipulate the DOM.
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Yes, Angular can use {@link http://jquery.com/ jQuery} if it's present in your app when the
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application is being bootstrapped. If jQuery is not present in your script path, Angular falls back
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to its own implementation of the subset of jQuery that we call {@link api/angular.element jQLite}.
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### What is testability like in angular?
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Very testable. It has an integrated dependency injection framework. See
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Very testable and designed this way from ground up. It has an integrated dependency injection
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framework, provides mocks for many heavy dependencies (server-side communication). See
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{@link api/ng service} for details.
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### How can I learn more about angular?
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Watch the July 28, 2010 talk
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"{@link http://www.youtube.com/watch?v=elvcgVSynRg| Angular: A Radically Different Way of Building
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AJAX Apps}".
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### How is angular licensed?
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The MIT License.

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