Index: src/wp-admin/network/site-new.php
===================================================================
--- src/wp-admin/network/site-new.php	(revision 42792)
+++ src/wp-admin/network/site-new.php	(working copy)
@@ -212,19 +212,20 @@
 	}
 }
 ?>
+<?php echo sprintf( ' ' . __('Required fields are marked %s'), '<span class="required">*</span>' ); ?>
 <form method="post" action="<?php echo network_admin_url( 'site-new.php?action=add-site' ); ?>" novalidate="novalidate">
 <?php wp_nonce_field( 'add-blog', '_wpnonce_add-blog' ); ?>
 	<table class="form-table">
 		<tr class="form-field form-required">
-			<th scope="row"><label for="site-address"><?php _e( 'Site Address (URL)' ); ?></label></th>
+			<th scope="row"><label for="site-address"><?php _e( 'Site Address (URL)' ); ?> <span class="required">*</span></label></th>
 			<td>
 			<?php if ( is_subdomain_install() ) { ?>
-				<input name="blog[domain]" type="text" class="regular-text" id="site-address" aria-describedby="site-address-desc" autocapitalize="none" autocorrect="off"/><span class="no-break">.<?php echo preg_replace( '|^www\.|', '', get_network()->domain ); ?></span>
+				<input name="blog[domain]" type="text" class="regular-text" id="site-address" aria-describedby="site-address-desc" autocapitalize="none" autocorrect="off" required="required"/><span class="no-break">.<?php echo preg_replace( '|^www\.|', '', get_network()->domain ); ?></span>
 			<?php
 } else {
 	echo get_network()->domain . get_network()->path
 	?>
-				<input name="blog[domain]" type="text" class="regular-text" id="site-address" aria-describedby="site-address-desc"  autocapitalize="none" autocorrect="off" />
+				<input name="blog[domain]" type="text" class="regular-text" id="site-address" aria-describedby="site-address-desc" autocapitalize="none" autocorrect="off" required="required"/>
 <?php
 }
 			echo '<p class="description" id="site-address-desc">' . __( 'Only lowercase letters (a-z), numbers, and hyphens are allowed.' ) . '</p>';
@@ -232,8 +233,8 @@
 			</td>
 		</tr>
 		<tr class="form-field form-required">
-			<th scope="row"><label for="site-title"><?php _e( 'Site Title' ); ?></label></th>
-			<td><input name="blog[title]" type="text" class="regular-text" id="site-title" /></td>
+			<th scope="row"><label for="site-title"><?php _e( 'Site Title' ); ?> <span class="required">*</span></label></th>
+			<td><input name="blog[title]" type="text" class="regular-text" id="site-title" required="required"/></td>
 		</tr>
 		<?php
 		$languages    = get_available_languages();
@@ -267,11 +268,11 @@
 			</tr>
 		<?php endif; // Languages. ?>
 		<tr class="form-field form-required">
-			<th scope="row"><label for="admin-email"><?php _e( 'Admin Email' ); ?></label></th>
-			<td><input name="blog[email]" type="email" class="regular-text wp-suggest-user" id="admin-email" data-autocomplete-type="search" data-autocomplete-field="user_email" /></td>
+			<th scope="row"><label for="admin-email"><?php _e( 'Admin Email' ); ?> <span class="required">*</span></label></th>
+			<td><input name="blog[email]" type="email" class="regular-text wp-suggest-user" id="admin-email" data-autocomplete-type="search" data-autocomplete-field="user_email" aria-describedby="site-admin-email" required="required"/></td>
 		</tr>
 		<tr class="form-field">
-			<td colspan="2"><?php _e( 'A new user will be created if the above email address is not in the database.' ); ?><br /><?php _e( 'The username and a link to set the password will be mailed to this email address.' ); ?></td>
+			<td colspan="2"><p id="site-admin-email"><?php _e( 'A new user will be created if the above email address is not in the database.' ); ?><br /><?php _e( 'The username and a link to set the password will be mailed to this email address.' ); ?></p></td>
 		</tr>
 	</table>