title: Should not allow any numbers and special characters other than space
body: <p>The text “Enter User Name” should be displayed by default in the text box. When the user starts entering the name, this text should disappear, is a mandatory field, should be validated. It should not allow any numbers and special characters other than space. Do not use javascript, use HTML 5 features.</p>
  
  <pre><code>&lt;input type="text name="username" placeholder="Enter User Name pattern="[A-Za-z\s]" required/&gt;
  </code></pre>
  
  <p>but it shows error as 
  "Must have used the HTML Component with the name 'username' with appropriate constraints"</p>