c# - ASP.net Webforms HTML5 "required" not working -


i quite new asp.net, trying use html5 required attribute on textbox. 

<form action="/../.." method="post" style="margin-bottom: 20px;" id="testform">       <input type="text" name="username" required="required">       <input type="submit" class="btn btn-primary" value="sign in" name="submit"/> </form>

when submit form without filling textbox data, doesnt show error message:

when inspect form, see class has been added required, no error message shows:

enter image description here

the same code works fine in jsfiddle, check out here


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