diff --git a/src/wp-admin/edit-comments.php b/src/wp-admin/edit-comments.php
index 28be5c9df9..ed34545584 100644
--- a/src/wp-admin/edit-comments.php
+++ b/src/wp-admin/edit-comments.php
@@ -345,7 +345,7 @@ if ( isset( $_REQUEST['approved'] ) || isset( $_REQUEST['deleted'] ) || isset( $
 			}
 		}
 
-		echo '<div id="moderated" class="updated notice is-dismissible"><p>' . implode( "<br/>\n", $messages ) . '</p></div>';
+		echo '<div id="moderated" class="updated notice is-dismissible"><p>' . implode( "<br />\n", $messages ) . '</p></div>';
 	}
 }
 ?>
diff --git a/src/wp-admin/includes/class-custom-background.php b/src/wp-admin/includes/class-custom-background.php
index 4914ebde39..f67105b0db 100644
--- a/src/wp-admin/includes/class-custom-background.php
+++ b/src/wp-admin/includes/class-custom-background.php
@@ -306,7 +306,7 @@ class Custom_Background {
 <td>
 <form method="post">
 			<?php wp_nonce_field( 'custom-background-remove', '_wpnonce-custom-background-remove' ); ?>
-			<?php submit_button( __( 'Remove Background Image' ), '', 'remove-background', false ); ?><br/>
+			<?php submit_button( __( 'Remove Background Image' ), '', 'remove-background', false ); ?><br />
 			<?php _e( 'This will remove the background image. You will not be able to restore any customizations.' ); ?>
 </form>
 </td>
@@ -320,7 +320,7 @@ class Custom_Background {
 <td>
 <form method="post">
 			<?php wp_nonce_field( 'custom-background-reset', '_wpnonce-custom-background-reset' ); ?>
-			<?php submit_button( __( 'Restore Original Image' ), '', 'reset-background', false ); ?><br/>
+			<?php submit_button( __( 'Restore Original Image' ), '', 'reset-background', false ); ?><br />
 			<?php _e( 'This will restore the original background image. You will not be able to restore any customizations.' ); ?>
 </form>
 </td>
diff --git a/src/wp-admin/includes/class-wp-filesystem-base.php b/src/wp-admin/includes/class-wp-filesystem-base.php
index 607915bfec..8d83b24dd6 100644
--- a/src/wp-admin/includes/class-wp-filesystem-base.php
+++ b/src/wp-admin/includes/class-wp-filesystem-base.php
@@ -262,7 +262,7 @@ class WP_Filesystem_Base {
 
 		if ( $this->verbose ) {
 			/* translators: 1: Folder to locate, 2: Folder to start searching from. */
-			printf( "\n" . __( 'Looking for %1$s in %2$s' ) . "<br/>\n", $folder, $base );
+			printf( "\n" . __( 'Looking for %1$s in %2$s' ) . "<br />\n", $folder, $base );
 		}
 
 		$folder_parts     = explode( '/', $folder );
@@ -291,7 +291,7 @@ class WP_Filesystem_Base {
 
 				if ( $this->verbose ) {
 					/* translators: %s: Directory name. */
-					printf( "\n" . __( 'Changing to %s' ) . "<br/>\n", $newdir );
+					printf( "\n" . __( 'Changing to %s' ) . "<br />\n", $newdir );
 				}
 
 				// Only search for the remaining path tokens in the directory, not the full path again.
@@ -309,7 +309,7 @@ class WP_Filesystem_Base {
 		if ( isset( $files[ $last_path ] ) ) {
 			if ( $this->verbose ) {
 				/* translators: %s: Directory name. */
-				printf( "\n" . __( 'Found %s' ) . "<br/>\n", $base . $last_path );
+				printf( "\n" . __( 'Found %s' ) . "<br />\n", $base . $last_path );
 			}
 
 			return trailingslashit( $base . $last_path );
diff --git a/src/wp-admin/includes/class-wp-ms-users-list-table.php b/src/wp-admin/includes/class-wp-ms-users-list-table.php
index d2ba7c72b5..f9eb81dc8d 100644
--- a/src/wp-admin/includes/class-wp-ms-users-list-table.php
+++ b/src/wp-admin/includes/class-wp-ms-users-list-table.php
@@ -443,7 +443,7 @@ class WP_MS_Users_List_Table extends WP_List_Table {
 				echo "<span class='$action'>$link$sep</span>";
 			}
 
-			echo '</small></span><br/>';
+			echo '</small></span><br />';
 		}
 	}
 
diff --git a/src/wp-admin/includes/class-wp-plugins-list-table.php b/src/wp-admin/includes/class-wp-plugins-list-table.php
index d5a4a93e3f..217689ef91 100644
--- a/src/wp-admin/includes/class-wp-plugins-list-table.php
+++ b/src/wp-admin/includes/class-wp-plugins-list-table.php
@@ -752,7 +752,7 @@ class WP_Plugins_List_Table extends WP_List_Table {
 			$plugin_name = $plugin_file;
 
 			if ( $plugin_file !== $plugin_data['Name'] ) {
-				$plugin_name .= '<br/>' . $plugin_data['Name'];
+				$plugin_name .= '<br />' . $plugin_data['Name'];
 			}
 
 			if ( true === ( $dropins[ $plugin_file ][1] ) ) { // Doesn't require a constant.
diff --git a/src/wp-admin/install.php b/src/wp-admin/install.php
index 8ff550c951..635113287d 100644
--- a/src/wp-admin/install.php
+++ b/src/wp-admin/install.php
@@ -187,7 +187,7 @@ function display_setup_form( $error = null ) {
 					if ( has_action( 'blog_privacy_selector' ) ) {
 						?>
 						<input id="blog-public" type="radio" name="blog_public" value="1" <?php checked( 1, $blog_public ); ?> />
-						<label for="blog-public"><?php _e( 'Allow search engines to index this site' ); ?></label><br/>
+						<label for="blog-public"><?php _e( 'Allow search engines to index this site' ); ?></label><br />
 						<input id="blog-norobots" type="radio" name="blog_public" value="0" <?php checked( 0, $blog_public ); ?> />
 						<label for="blog-norobots"><?php _e( 'Discourage search engines from indexing this site' ); ?></label>
 						<p class="description"><?php _e( 'Note: Neither of these options blocks access to your site &mdash; it is up to search engines to honor your request.' ); ?></p>
diff --git a/src/wp-admin/network/settings.php b/src/wp-admin/network/settings.php
index 75c13ae863..8de34f47d8 100644
--- a/src/wp-admin/network/settings.php
+++ b/src/wp-admin/network/settings.php
@@ -497,7 +497,7 @@ if ( isset( $_GET['updated'] ) ) {
 						echo '<fieldset><legend class="screen-reader-text">' . __( 'Enable menus' ) . '</legend>';
 
 						foreach ( (array) $menu_items as $key => $val ) {
-							echo "<label><input type='checkbox' name='menu_items[" . $key . "]' value='1'" . ( isset( $menu_perms[ $key ] ) ? checked( $menu_perms[ $key ], '1', false ) : '' ) . ' /> ' . esc_html( $val ) . '</label><br/>';
+							echo "<label><input type='checkbox' name='menu_items[" . $key . "]' value='1'" . ( isset( $menu_perms[ $key ] ) ? checked( $menu_perms[ $key ], '1', false ) : '' ) . ' /> ' . esc_html( $val ) . '</label><br />';
 						}
 
 						echo '</fieldset>';
diff --git a/src/wp-admin/network/site-info.php b/src/wp-admin/network/site-info.php
index 8cad4ead2a..894ebf048f 100644
--- a/src/wp-admin/network/site-info.php
+++ b/src/wp-admin/network/site-info.php
@@ -197,7 +197,7 @@ if ( ! empty( $messages ) ) {
 			<legend class="screen-reader-text"><?php _e( 'Set site attributes' ); ?></legend>
 			<?php foreach ( $attribute_fields as $field_key => $field_label ) : ?>
 				<label><input type="checkbox" name="blog[<?php echo $field_key; ?>]" value="1" <?php checked( (bool) $details->$field_key, true ); ?> <?php disabled( ! in_array( (int) $details->$field_key, array( 0, 1 ), true ) ); ?> />
-				<?php echo $field_label; ?></label><br/>
+				<?php echo $field_label; ?></label><br />
 			<?php endforeach; ?>
 			<fieldset>
 			</td>
diff --git a/src/wp-admin/options-reading.php b/src/wp-admin/options-reading.php
index 2c89f14474..cf3dd98e5b 100644
--- a/src/wp-admin/options-reading.php
+++ b/src/wp-admin/options-reading.php
@@ -181,7 +181,7 @@ else :
 <td><fieldset><legend class="screen-reader-text"><span><?php has_action( 'blog_privacy_selector' ) ? _e( 'Site visibility' ) : _e( 'Search engine visibility' ); ?> </span></legend>
 <?php if ( has_action( 'blog_privacy_selector' ) ) : ?>
 	<input id="blog-public" type="radio" name="blog_public" value="1" <?php checked( '1', get_option( 'blog_public' ) ); ?> />
-	<label for="blog-public"><?php _e( 'Allow search engines to index this site' ); ?></label><br/>
+	<label for="blog-public"><?php _e( 'Allow search engines to index this site' ); ?></label><br />
 	<input id="blog-norobots" type="radio" name="blog_public" value="0" <?php checked( '0', get_option( 'blog_public' ) ); ?> />
 	<label for="blog-norobots"><?php _e( 'Discourage search engines from indexing this site' ); ?></label>
 	<p class="description"><?php _e( 'Note: Neither of these options blocks access to your site &mdash; it is up to search engines to honor your request.' ); ?></p>