If the application have the auto-complete (auto-suggest) functionality, then first time when i am type a character then some text auto suggestion will appear, from the next time when i am trying to enter the same test then browser auto-complete is working along with the our auto-complete. To avoid that problem add the following code in the text box:
<input type="text" name="userName" autocomplete="off" />
Hope it will be useful.
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nice tricky,