Index: src/wp-login.php
===================================================================
--- src/wp-login.php	(revision 49101)
+++ src/wp-login.php	(working copy)
@@ -871,7 +871,7 @@
 		<form name="lostpasswordform" id="lostpasswordform" action="<?php echo esc_url( network_site_url( 'wp-login.php?action=lostpassword', 'login_post' ) ); ?>" method="post">
 			<p>
 				<label for="user_login"><?php _e( 'Username or Email Address' ); ?></label>
-				<input type="text" name="user_login" id="user_login" class="input" value="<?php echo esc_attr( $user_login ); ?>" size="20" autocapitalize="off" />
+				<input type="text" name="user_login" id="user_login" class="input" value="<?php echo esc_attr( $user_login ); ?>" size="20" autocapitalize="off" required="required" />
 			</p>
 			<?php
 
@@ -985,7 +985,7 @@
 				</p>
 
 				<div class="wp-pwd">
-					<input type="password" data-reveal="1" data-pw="<?php echo esc_attr( wp_generate_password( 16 ) ); ?>" name="pass1" id="pass1" class="input password-input" size="24" value="" autocomplete="off" aria-describedby="pass-strength-result" />
+					<input type="password" data-reveal="1" data-pw="<?php echo esc_attr( wp_generate_password( 16 ) ); ?>" name="pass1" id="pass1" class="input password-input" size="24" value="" autocomplete="off" aria-describedby="pass-strength-result" required="required" />
 
 					<button type="button" class="button button-secondary wp-hide-pw hide-if-no-js" data-toggle="0" aria-label="<?php esc_attr_e( 'Hide password' ); ?>">
 						<span class="dashicons dashicons-hidden" aria-hidden="true"></span>
@@ -1000,7 +1000,7 @@
 
 			<p class="user-pass2-wrap">
 				<label for="pass2"><?php _e( 'Confirm new password' ); ?></label>
-				<input type="password" name="pass2" id="pass2" class="input" size="20" value="" autocomplete="off" />
+				<input type="password" name="pass2" id="pass2" class="input" size="20" value="" autocomplete="off" required="required" />
 			</p>
 
 			<p class="description indicator-hint"><?php echo wp_get_password_hint(); ?></p>
@@ -1100,11 +1100,11 @@
 		<form name="registerform" id="registerform" action="<?php echo esc_url( site_url( 'wp-login.php?action=register', 'login_post' ) ); ?>" method="post" novalidate="novalidate">
 			<p>
 				<label for="user_login"><?php _e( 'Username' ); ?></label>
-				<input type="text" name="user_login" id="user_login" class="input" value="<?php echo esc_attr( wp_unslash( $user_login ) ); ?>" size="20" autocapitalize="off" />
+				<input type="text" name="user_login" id="user_login" class="input" value="<?php echo esc_attr( wp_unslash( $user_login ) ); ?>" size="20" autocapitalize="off" required="required" />
 			</p>
 			<p>
 				<label for="user_email"><?php _e( 'Email' ); ?></label>
-				<input type="email" name="user_email" id="user_email" class="input" value="<?php echo esc_attr( wp_unslash( $user_email ) ); ?>" size="25" />
+				<input type="email" name="user_email" id="user_email" class="input" value="<?php echo esc_attr( wp_unslash( $user_email ) ); ?>" size="25" required="required" />
 			</p>
 			<?php
 
@@ -1409,13 +1409,13 @@
 		<form name="loginform" id="loginform" action="<?php echo esc_url( site_url( 'wp-login.php', 'login_post' ) ); ?>" method="post">
 			<p>
 				<label for="user_login"><?php _e( 'Username or Email Address' ); ?></label>
-				<input type="text" name="log" id="user_login"<?php echo $aria_describedby_error; ?> class="input" value="<?php echo esc_attr( $user_login ); ?>" size="20" autocapitalize="off" />
+				<input type="text" name="log" id="user_login"<?php echo $aria_describedby_error; ?> class="input" value="<?php echo esc_attr( $user_login ); ?>" size="20" autocapitalize="off" required="required" />
 			</p>
 
 			<div class="user-pass-wrap">
 				<label for="user_pass"><?php _e( 'Password' ); ?></label>
 				<div class="wp-pwd">
-					<input type="password" name="pwd" id="user_pass"<?php echo $aria_describedby_error; ?> class="input password-input" value="" size="20" />
+					<input type="password" name="pwd" id="user_pass"<?php echo $aria_describedby_error; ?> class="input password-input" value="" size="20" required="required" />
 					<button type="button" class="button button-secondary wp-hide-pw hide-if-no-js" data-toggle="0" aria-label="<?php esc_attr_e( 'Show password' ); ?>">
 						<span class="dashicons dashicons-visibility" aria-hidden="true"></span>
 					</button>