HTML5 for TextBox

<asp:TextBox ID="txtName" runat="server" placeholder="Name" required="a" title="Enter the Name" pattern="[a-zA-Z]+"></asp:TextBox>

when submit the textbox as  empty validation Required

Title is for small alert Message  for the user.
Placeholder is the small Description of the Input which is needed .
Required is  the Required Field Validation
Pattern  Checking for input