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<title>YUI Library Examples: Test: Asynchronous Testing</title> |
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<div id="ygma"><a href="../../"><img src="../../assets/logo.gif" border="0" width="200" height="93"></a></div> |
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<div id="pagetitle"><h1>YUI Library Examples: Test: Asynchronous Testing</h1></div> |
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<div id="bar-note"><p><strong>Note:</strong> This is YUI 3.x. Looking for <a href="http://developer.yahoo.com/yui/">YUI 2.x</a>?</p></div> |
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<div class="yui-u first example" id="main"> |
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<h2>Test: Asynchronous Testing</h2> |
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<div id="example" class="promo"> |
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<p> |
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<p>This example shows how to create an asynchronous test with the YUI Test framework for testing browser-based JavaScript code. |
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A <code>Y.Test.Case</code> object is created with a test that waits for a |
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few seconds before continuing. The <code>Y.Test.Runner</code> |
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is then used to run the tests once the page has loaded.</p> </p> |
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<div class="module example-container "> |
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<p class="newWindowButton yui-skin-sam"> |
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<a href="test-async-test_clean.html" target="_blank">View example in new window.</a> |
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</p> |
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</div> <div id="example-canvas" class="bd"> |
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<!--BEGIN SOURCE CODE FOR EXAMPLE =============================== --> |
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<div id="testLogger"></div> |
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<script type="text/javascript"> |
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YUI({base:"../../build/", timeout: 10000}).use("node", "console", "test",function (Y) { |
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Y.namespace("example.test"); |
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Y.example.test.AsyncTestCase = new Y.Test.Case({ |
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//name of the test case - if not provided, one is auto-generated |
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name : "Asynchronous Tests", |
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//--------------------------------------------------------------------- |
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// setUp and tearDown methods - optional |
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//--------------------------------------------------------------------- |
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/* |
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* Sets up data that is needed by each test. |
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*/ |
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setUp : function () { |
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this.data = { |
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name: "test", |
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year: 2007, |
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beta: true |
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}; |
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}, |
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/* |
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* Cleans up everything that was created by setUp(). |
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*/ |
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tearDown : function () { |
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delete this.data; |
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}, |
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//--------------------------------------------------------------------- |
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// Test methods - names must begin with "test" |
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//--------------------------------------------------------------------- |
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testWait : function (){ |
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var Assert = Y.Assert; |
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//do some assertions now |
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Assert.isTrue(this.data.beta); |
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Assert.isNumber(this.data.year); |
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//wait five seconds and do some more |
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this.wait(function(){ |
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Assert.isString(this.data.name); |
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}, 5000); |
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} |
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}); |
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//create the console |
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var r = new Y.Console({ |
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verbose : true, |
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newestOnTop : false |
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}); |
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r.render('#testLogger'); |
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Y.Test.Runner.add(Y.example.test.AsyncTestCase); |
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//run the tests |
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Y.Test.Runner.run(); |
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}); |
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</script> |
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<!--END SOURCE CODE FOR EXAMPLE =============================== --> |
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</div> |
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</div> |
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</div> |
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<h2 class="first">Asynchronous Test Example</h2> |
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<p>This example begins by creating a namespace:</p> |
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<textarea name="code" class="JScript" cols="60" rows="1"> |
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Y.namespace("example.test"); |
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</textarea> |
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<p>This namespace serves as the core object upon which others will be added (to prevent creating global objects).</p> |
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<h3>Creating the TestCase</h3> |
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<p>The first step is to create a new <code>Y.Test.Case</code> object called <code>AsyncTestCase</code>. |
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To do so, using the <code>Y.Test.Case</code> constructor and pass in an object literal containing information about the tests to be run:</p> |
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<textarea name="code" class="JScript" cols="60" rows="1"> |
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Y.example.test.AsyncTestCase = new Y.Test.Case({ |
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//name of the test case - if not provided, one is auto-generated |
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name : "Asynchronous Tests", |
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//--------------------------------------------------------------------- |
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// setUp and tearDown methods - optional |
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//--------------------------------------------------------------------- |
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/* |
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* Sets up data that is needed by each test. |
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*/ |
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setUp : function () { |
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this.data = { |
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name: "test", |
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year: 2007, |
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beta: true |
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}; |
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}, |
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/* |
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* Cleans up everything that was created by setUp(). |
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*/ |
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tearDown : function () { |
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delete this.data; |
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}, |
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//--------------------------------------------------------------------- |
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// Test methods - names must begin with "test" |
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//--------------------------------------------------------------------- |
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testWait : function (){ |
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var Assert = Y.Assert; |
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//do some assertions now |
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Assert.isTrue(this.data.beta); |
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Assert.isNumber(this.data.year); |
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//wait five seconds and do some more |
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this.wait(function(){ |
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Assert.isString(this.data.name); |
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}, 5000); |
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} |
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}); |
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</textarea> |
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<p>The object literal passed into the constructor contains two different sections. The first section contains the <code>name</code> property, |
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which is used to determine which <code>Y.Test.Case</code> is being executed. A name is necessary, so one is generated if it isn't specified.</p> |
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<p>Next, the <code>setUp()</code> and <code>tearDown()</code> methods are included. The <code>setUp()</code> method is used in a <code>Y.Test.Case</code> |
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to set up data that may be needed for tests to be completed. This method is called immediately before each test is executed. For this example, |
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<code>setUp()</code> creates a data object. The <code>tearDown()</code> is responsible for undoing what was done in <code>setUp()</code>. It is |
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run immediately after each test is run and, in this case, deletes the data object that was created by <code>setUp</code>. These methods are optional.</p> |
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<p>The second section contains the actual tests to be run. The only test is <code>testWait()</code>, which demonstrates using |
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the <code>wait()</code> method to delay test execution. There are two arguments passed in: a function to run once the test resumes |
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and the number of milliseconds to wait before running this function (same basic format as <code>setTimeout()</code>). When |
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the test resumes, the function is executed in the context of the <code>Y.Test.Case</code> object, meaning that it still has |
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access to all of the same data as the test that called <code>wait()</code>, including properties and methods on the <code>Y.Test.Case</code> |
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itself. This example shows the anonymous function using both the <code>Y.Assert</code> object and the <code>data</code> property |
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of the <code>Y.Test.Case</code>.</p> |
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<h3>Running the tests</h3> |
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<p>With all of the tests defined, the last step is to run them:</p> |
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<textarea name="code" class="JScript" cols="60" rows="1"> |
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//create the console |
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var r = new Y.Console({ |
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verbose : true, |
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newestOnTop : false |
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}); |
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r.render('#testLogger'); |
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//add the test suite to the runner's queue |
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Y.Test.Runner.add(Y.example.test.AsyncTestCase); |
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//run the tests |
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Y.Test.Runner.run(); |
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</textarea> |
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<p>Before running the tests, it's necessary to create a <code>Y.Console</code> object to display the results (otherwise the tests would run |
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but you wouldn't see the results). After that, the <code>Y.Test.Runner</code> is loaded with the <code>Y.Test.Case</code> object by calling |
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<code>add()</code> (any number of <code>Y.Test.Case</code> and <code>TestSuite</code> objects can be added to a <code>TestRunner</code>, |
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this example only adds one for simplicity). The very last step is to call <code>run()</code>, which begins executing the tests in its |
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queue and displays the results in the <code>Y.Console</code>.</p> </div> |
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<div class="yui-u sidebar"> |
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<div id="examples" class="mod box4"> |
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<div class="hd"> |
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<h4> |
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Test Examples:</h4> |
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</div> |
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<div class="bd"> |
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<ul> |
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<li><a href='../test/test-simple-example.html'>Simple Testing Example</a></li><li><a href='../test/test-advanced-test-options.html'>Advanced Test Options</a></li><li><a href='../test/test-array-tests.html'>Array Processing</a></li><li class='selected'><a href='../test/test-async-test.html'>Asynchronous Testing</a></li><li><a href='../test/test-async-event-tests.html'>Asynchronous Event Testing</a></li> </ul> |
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</div> |
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</div> |
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<div class="mod box4"> |
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<div class="hd"> |
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<h4>More Test Resources:</h4> |
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</div> |
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<div class="bd"> |
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<ul> |
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<!-- <li><a href="http://developer.yahoo.com/yui/test/">User's Guide</a> (external)</li> --> |
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<li><a href="../../api/module_test.html">API Documentation</a></li> |
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</ul> |
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</div> |
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</div> |
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</div> |
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</div> |
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</div> |
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</div> |
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<div class="yui-b toc3" id="tocWrapper"> |
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User Interface (YUI) Library." href="http://tech.groups.yahoo.com/group/yui3/">YUI 3 Forum (external)</a></li><li class="item"><a title="YUI is used by Yahoo! and by hundreds of other sites, including many you know and love." href="/yui/poweredby/">YUI Sightings (external)</a></li><li class="item"><a title="Videos and podcasts from the YUI Team and from the Yahoo! frontend engineering community." href="http://developer.yahoo.com/yui/theater/">YUI Theater (external)</a></li><li class="sect">YUI Articles on the YUI Website</li><li class="item"><a title="Answers to Frequently Asked Questions about the YUI Library" href="http://developer.yahoo.com/yui/articles/faq/">YUI FAQ (external)</a></li><li class="item"><a title="Yahoo!'s philosophy of Graded Browser Support" href="http://developer.yahoo.com/yui/articles/gbs/">Graded Browser Support (external)</a></li><li class="item"><a title="Reporting Bugs and Making Feature Requests for YUI Components" href="http://developer.yahoo.com/yui/articles/reportingbugs/">Bug Reports/Feature Requests (external)</a></li><li class="item"><a title="Serve YUI source files from Yahoo! -- free, fast, and simple" href="http://developer.yahoo.com/yui/3/articles/hosting/">Serving YUI Files from Yahoo! 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