Update payment-form.html

Author: CBID2

html/forms/html-form-structure/payment-form.html

@@ -48,14 +48,14 @@ <h2>Contact information</h2>
                 <span>E-mail: </span>
                 <strong><span aria-label="required">*</span></strong>
               </label>
-              <input type="email" id="mail" name="usermail">
+              <input type="email" id="mail" name="usermail" required="true">
             </p>
             <p>
               <label for="pwd">
                 <span>Password: </span>
                 <strong><span aria-label="required">*</span></strong>
               </label>
-              <input type="password" id="pwd" name="password">
+              <input type="password" id="pwd" name="password" required="true">
             </p>
         </section>
         <section>
@@ -75,7 +75,7 @@ <h2>Payment information</h2>
                 <span>Card number:</span>
                 <strong><span aria-label="required">*</span></strong>
               </label>
-                <input type="tel" id="number" name="cardnumber">
+                <input type="tel" id="number" name="cardnumber" required="true">
             </p>
             <p>
               <label for="expiration">