H93 (Fail): Ensuring that id attributes are unique on a Web page

HTML Snippet Code
Scenario 1: ID values are not unique




<label for="uname">Firstname</label> <input id="uname" type="text" /></br> <label for="ln">Lastname</label> <input input id="ln" type="text" /></br> <label for="em">Email</label> <input input id="em" type="text" /></br> <label for="ps">password</label> <input input id="ps" type="text" /></br> <button id="btn">submit</button> <button id="btn">Cancel</button>