diff --git a/src/wp-admin/admin-footer.php b/src/wp-admin/admin-footer.php
index 099b45dfe0..0bacf34026 100644
--- a/src/wp-admin/admin-footer.php
+++ b/src/wp-admin/admin-footer.php
@@ -114,6 +114,6 @@ if ( function_exists( 'get_site_option' ) ) {
 ?>
 
 <div class="clear"></div></div><!-- wpwrap -->
-<script type="text/javascript">if(typeof wpOnload=='function')wpOnload();</script>
+<script type="text/javascript">if(typeof wpOnload==='function')wpOnload();</script>
 </body>
 </html>
diff --git a/src/wp-admin/includes/media.php b/src/wp-admin/includes/media.php
index 567cd1f823..14a8d99b49 100644
--- a/src/wp-admin/includes/media.php
+++ b/src/wp-admin/includes/media.php
@@ -533,7 +533,7 @@ function wp_iframe( $content_func, ...$args ) {
 
 	?>
 	<script type="text/javascript">
-	addLoadEvent = function(func){if(typeof jQuery!="undefined")jQuery(document).ready(func);else if(typeof wpOnload!='function'){wpOnload=func;}else{var oldonload=wpOnload;wpOnload=function(){oldonload();func();}}};
+	addLoadEvent = function(func){if(typeof jQuery!=='undefined')jQuery(document).ready(func);else if(typeof wpOnload!=='function'){wpOnload=func;}else{var oldonload=wpOnload;wpOnload=function(){oldonload();func();}}};
 	var ajaxurl = '<?php echo esc_js( admin_url( 'admin-ajax.php', 'relative' ) ); ?>', pagenow = 'media-upload-popup', adminpage = 'media-upload-popup',
 	isRtl = <?php echo (int) is_rtl(); ?>;
 	</script>
@@ -607,7 +607,7 @@ function wp_iframe( $content_func, ...$args ) {
 	do_action( 'admin_print_footer_scripts' );
 
 	?>
-	<script type="text/javascript">if(typeof wpOnload=='function')wpOnload();</script>
+	<script type="text/javascript">if(typeof wpOnload==='function')wpOnload();</script>
 	</body>
 	</html>
 	<?php
diff --git a/src/wp-admin/includes/template.php b/src/wp-admin/includes/template.php
index c3dd095d64..c96389734a 100644
--- a/src/wp-admin/includes/template.php
+++ b/src/wp-admin/includes/template.php
@@ -2025,7 +2025,7 @@ function iframe_header( $title = '', $deprecated = false ) {
 	wp_enqueue_style( 'colors' );
 	?>
 <script type="text/javascript">
-addLoadEvent = function(func){if(typeof jQuery!="undefined")jQuery(document).ready(func);else if(typeof wpOnload!='function'){wpOnload=func;}else{var oldonload=wpOnload;wpOnload=function(){oldonload();func();}}};
+addLoadEvent = function(func){if(typeof jQuery!=='undefined')jQuery(document).ready(func);else if(typeof wpOnload!=='function'){wpOnload=func;}else{var oldonload=wpOnload;wpOnload=function(){oldonload();func();}}};
 function tb_close(){var win=window.dialogArguments||opener||parent||top;win.tb_remove();}
 var ajaxurl = '<?php echo esc_js( admin_url( 'admin-ajax.php', 'relative' ) ); ?>',
 	pagenow = '<?php echo esc_js( $current_screen->id ); ?>',
@@ -2115,7 +2115,7 @@ function iframe_footer() {
 	do_action( 'admin_print_footer_scripts' );
 	?>
 	</div>
-<script type="text/javascript">if(typeof wpOnload=="function")wpOnload();</script>
+<script type="text/javascript">if(typeof wpOnload==='function')wpOnload();</script>
 </body>
 </html>
 	<?php
diff --git a/src/wp-login.php b/src/wp-login.php
index 44c8b9bbc2..3d7769d4b1 100644
--- a/src/wp-login.php
+++ b/src/wp-login.php
@@ -317,7 +317,7 @@ function login_footer( $input_id = '' ) {
 		?>
 		<script type="text/javascript">
 		try{document.getElementById('<?php echo $input_id; ?>').focus();}catch(e){}
-		if(typeof wpOnload=='function')wpOnload();
+		if(typeof wpOnload==='function')wpOnload();
 		</script>
 		<?php
 	}