title: HtmlUnitDriver is unable to locate a node
body: <p>I cannot get HtmlUnitDriver to find elements on a page I am trying to access. WebDriver on the other hand works fine. Both are using the same method.
  Here is my code:</p>
  
  <pre><code>import java.util.logging.*;
  import org.openqa.selenium.By;
  import org.openqa.selenium.WebDriver;
  import org.openqa.selenium.WebElement;
  import org.openqa.selenium.firefox.FirefoxDriver;
  import org.openqa.selenium.htmlunit.HtmlUnitDriver;
  import com.gargoylesoftware.htmlunit.BrowserVersion;
  
  
  public class Main {
  
  
      public static void main(String[]args)
      {
          FirefoxDriver driver2=new FirefoxDriver();
  
          HtmlUnitDriver driver=new HtmlUnitDriver(BrowserVersion.FIREFOX_10);
          driver.setJavascriptEnabled(true);
          Logger.getLogger("com.gargoylesoftware").setLevel(Level.OFF);
  
          runTest(driver2); //works
          runTest(driver);  //does not work
      }
  
      public static void runTest(WebDriver driver)
      {
          driver.get("http://10.3.1.164");
          WebElement elem=driver.findElement(By.xpath("//td[2]/input"));
          assert elem.isDisplayed();
          System.out.println(driver.getTitle());
      }
  }
  </code></pre>
  
  <p>Here is the stacktrace:</p>
  
  <pre><code>Exception in thread "main" org.openqa.selenium.NoSuchElementException: Unable to     locate a node using //td[2]/input
  For documentation on this error, please visit: http://seleniumhq.org/exceptions/no_such_element.html
  Build info: version: '2.28.0', revision: '18309', time: '2012-12-11 20:21:45'
  System info: os.name: 'Windows 7', os.arch: 'amd64', os.version: '6.1', java.version: '1.7.0_10'
  Driver info: driver.version: HtmlUnitDriver
  at     org.openqa.selenium.htmlunit.HtmlUnitDriver.findElementByXPath(HtmlUnitDriver.java:805)
  at org.openqa.selenium.By$ByXPath.findElement(By.java:344)
  at org.openqa.selenium.htmlunit.HtmlUnitDriver$5.call(HtmlUnitDriver.java:1247)
  at org.openqa.selenium.htmlunit.HtmlUnitDriver$5.call(HtmlUnitDriver.java:1)
  at org.openqa.selenium.htmlunit.HtmlUnitDriver.implicitlyWaitFor(HtmlUnitDriver.java:987)
  at org.openqa.selenium.htmlunit.HtmlUnitDriver.findElement(HtmlUnitDriver.java:1244)
  at org.openqa.selenium.htmlunit.HtmlUnitDriver.findElement(HtmlUnitDriver.java:393)
  at Main.runTest(Main.java:28)
  at Main.main(Main.java:22)
  </code></pre>