diff --git src/wp-admin/about.php src/wp-admin/about.php
index 3cdd964a4c..0e37a291be 100644
--- src/wp-admin/about.php
+++ src/wp-admin/about.php
@@ -59,7 +59,7 @@ require_once ABSPATH . 'wp-admin/admin-header.php';
 		<div class="about__section has-2-columns">
 			<div class="column is-edge-to-edge has-accent-background-color">
 				<div class="about__image aligncenter">
-					<img src="data:image/svg+xml;charset=utf8,%3Csvg width='660' height='818' viewbox='0 0 660 818' xmlns='http://www.w3.org/2000/svg'%3E%3Crect x='99' y='178' width='132' height='132' fill='%23F4EFE1'/%3E%3Crect x='231' y='310' width='99' height='99' fill='%2344141E'/%3E%3Crect x='330' y='409' width='132' height='132' fill='%23F4EFE1'/%3E%3Crect x='462' y='541' width='99' height='99' fill='%2344141E'/%3E%3C/svg%3E" alt="" />
+					<img src="data:image/svg+xml;charset=utf8,%3Csvg width='660' height='818' viewbox='0 0 660 818' xmlns='https://www.w3.org/2000/svg'%3E%3Crect x='99' y='178' width='132' height='132' fill='%23F4EFE1'/%3E%3Crect x='231' y='310' width='99' height='99' fill='%2344141E'/%3E%3Crect x='330' y='409' width='132' height='132' fill='%23F4EFE1'/%3E%3Crect x='462' y='541' width='99' height='99' fill='%2344141E'/%3E%3C/svg%3E" alt="" />
 				</div>
 			</div>
 			<div class="column is-vertically-aligned-center">
@@ -96,7 +96,7 @@ require_once ABSPATH . 'wp-admin/admin-header.php';
 			</div>
 			<div class="column is-edge-to-edge has-accent-background-color">
 				<div class="about__image aligncenter">
-					<img src="data:image/svg+xml;charset=utf8,%3Csvg width='500' height='500' viewbox='0 0 500 500' xmlns='http://www.w3.org/2000/svg'%3E%3Crect x='75' y='200' width='150' height='75' fill='%2344141E'/%3E%3Crect x='175' y='75' width='50' height='100' fill='%2385273B'/%3E%3Crect x='75' y='75' width='75' height='100' fill='%23F4EFE1'/%3E%3Crect x='250' y='200' width='175' height='75' fill='%2344141E'/%3E%3Crect x='350' y='75' width='75' height='100' fill='%2385273B'/%3E%3Crect x='250' y='75' width='75' height='100' fill='%23F4EFE1'/%3E%3Crect x='75' y='375' width='150' height='50' fill='%2344141E'/%3E%3Crect x='175' y='300' width='50' height='50' fill='%2385273B'/%3E%3Crect x='75' y='300' width='75' height='50' fill='%23F4EFE1'/%3E%3Crect x='250' y='372.5' width='175' height='52.5' fill='%2344141E'/%3E%3Crect x='350' y='300' width='75' height='50' fill='%2385273B'/%3E%3Crect x='250' y='300' width='75' height='50' fill='%23F4EFE1'/%3E%3C/svg%3E%0A" alt="">
+					<img src="data:image/svg+xml;charset=utf8,%3Csvg width='500' height='500' viewbox='0 0 500 500' xmlns='https://www.w3.org/2000/svg'%3E%3Crect x='75' y='200' width='150' height='75' fill='%2344141E'/%3E%3Crect x='175' y='75' width='50' height='100' fill='%2385273B'/%3E%3Crect x='75' y='75' width='75' height='100' fill='%23F4EFE1'/%3E%3Crect x='250' y='200' width='175' height='75' fill='%2344141E'/%3E%3Crect x='350' y='75' width='75' height='100' fill='%2385273B'/%3E%3Crect x='250' y='75' width='75' height='100' fill='%23F4EFE1'/%3E%3Crect x='75' y='375' width='150' height='50' fill='%2344141E'/%3E%3Crect x='175' y='300' width='50' height='50' fill='%2385273B'/%3E%3Crect x='75' y='300' width='75' height='50' fill='%23F4EFE1'/%3E%3Crect x='250' y='372.5' width='175' height='52.5' fill='%2344141E'/%3E%3Crect x='350' y='300' width='75' height='50' fill='%2385273B'/%3E%3Crect x='250' y='300' width='75' height='50' fill='%23F4EFE1'/%3E%3C/svg%3E%0A" alt="">
 				</div>
 			</div>
 		</div>
@@ -153,7 +153,7 @@ require_once ABSPATH . 'wp-admin/admin-header.php';
 		<div class="about__section">
 			<div class="column is-edge-to-edge">
 				<div class="about__image aligncenter">
-					<img src="data:image/svg+xml;charset=utf8,%3Csvg width='1000' height='498' viewbox='0 0 1000 498' xmlns='http://www.w3.org/2000/svg'%3E%3Crect x='865.463' y='36.8596' width='133.8' height='132.326' fill='%23942F44'/%3E%3Crect x='865.463' y='180.98' width='133.8' height='132.326' fill='%23942F44'/%3E%3Crect x='866.2' y='328.05' width='133.8' height='132.694' fill='%23942F44'/%3E%3Crect y='331.736' width='405.455' height='134.169' fill='%234E1521'/%3E%3Crect y='36.8596' width='405.455' height='129.008' fill='%234E1521'/%3E%3Crect y='184.298' width='387.025' height='133.8' fill='%234E1521'/%3E%3Crect x='719.13' y='34.6479' width='133.8' height='428.677' fill='%23BD3854'/%3E%3Crect x='571.323' y='18.4297' width='133.8' height='423.885' fill='%23BD3854'/%3E%3Crect x='423.516' y='35.0164' width='133.8' height='425.728' fill='%23BD3854'/%3E%3C/svg%3E" alt="" />
+					<img src="data:image/svg+xml;charset=utf8,%3Csvg width='1000' height='498' viewbox='0 0 1000 498' xmlns='https://www.w3.org/2000/svg'%3E%3Crect x='865.463' y='36.8596' width='133.8' height='132.326' fill='%23942F44'/%3E%3Crect x='865.463' y='180.98' width='133.8' height='132.326' fill='%23942F44'/%3E%3Crect x='866.2' y='328.05' width='133.8' height='132.694' fill='%23942F44'/%3E%3Crect y='331.736' width='405.455' height='134.169' fill='%234E1521'/%3E%3Crect y='36.8596' width='405.455' height='129.008' fill='%234E1521'/%3E%3Crect y='184.298' width='387.025' height='133.8' fill='%234E1521'/%3E%3Crect x='719.13' y='34.6479' width='133.8' height='428.677' fill='%23BD3854'/%3E%3Crect x='571.323' y='18.4297' width='133.8' height='423.885' fill='%23BD3854'/%3E%3Crect x='423.516' y='35.0164' width='133.8' height='425.728' fill='%23BD3854'/%3E%3C/svg%3E" alt="" />
 				</div>
 			</div>
 		</div>
diff --git src/wp-admin/credits.php src/wp-admin/credits.php
index 6dad50bdce..99ae36f9c7 100644
--- src/wp-admin/credits.php
+++ src/wp-admin/credits.php
@@ -75,7 +75,7 @@ $credits = wp_credits();
 		</div>
 
 		<div class="about__image aligncenter">
-			<img src="data:image/svg+xml;charset=utf8,%3Csvg width='1320' height='350' viewbox='0 0 1320 350' xmlns='http://www.w3.org/2000/svg'%3E%3Crect width='72' height='220' transform='matrix(1 0 0 -1 61 220)' fill='%23321017'/%3E%3Crect width='72' height='250' transform='matrix(1 0 0 -1 166 300)' fill='%23BD3854'/%3E%3Crect width='72' height='220' transform='matrix(1 0 0 -1 272 220)' fill='%23321017'/%3E%3Crect width='71' height='220' transform='matrix(1 0 0 -1 378 220)' fill='%235F1B29'/%3E%3Crect width='71' height='220' transform='matrix(1 0 0 -1 483 220)' fill='%23321017'/%3E%3Crect width='71' height='220' transform='matrix(1 0 0 -1 587 220)' fill='%235F1B29'/%3E%3Crect width='71.28' height='250' transform='matrix(1 0 0 -1 689 300)' fill='%23BD3854'/%3E%3Crect width='72' height='220' transform='matrix(1 0 0 -1 884 220)' fill='%235F1B29'/%3E%3Crect width='72' height='220' transform='matrix(1 0 0 -1 789 220)' fill='%23321017'/%3E%3Crect width='71' height='220' transform='matrix(1 0 0 -1 985 220)' fill='%23321017'/%3E%3Crect width='72' height='220' transform='matrix(1 0 0 -1 1084 220)' fill='%235F1B29'/%3E%3Crect width='72' height='220' transform='matrix(1 0 0 -1 1179 220)' fill='%233D0F19'/%3E%3C/svg%3E%0A" alt="" />
+			<img src="data:image/svg+xml;charset=utf8,%3Csvg width='1320' height='350' viewbox='0 0 1320 350' xmlns='https://www.w3.org/2000/svg'%3E%3Crect width='72' height='220' transform='matrix(1 0 0 -1 61 220)' fill='%23321017'/%3E%3Crect width='72' height='250' transform='matrix(1 0 0 -1 166 300)' fill='%23BD3854'/%3E%3Crect width='72' height='220' transform='matrix(1 0 0 -1 272 220)' fill='%23321017'/%3E%3Crect width='71' height='220' transform='matrix(1 0 0 -1 378 220)' fill='%235F1B29'/%3E%3Crect width='71' height='220' transform='matrix(1 0 0 -1 483 220)' fill='%23321017'/%3E%3Crect width='71' height='220' transform='matrix(1 0 0 -1 587 220)' fill='%235F1B29'/%3E%3Crect width='71.28' height='250' transform='matrix(1 0 0 -1 689 300)' fill='%23BD3854'/%3E%3Crect width='72' height='220' transform='matrix(1 0 0 -1 884 220)' fill='%235F1B29'/%3E%3Crect width='72' height='220' transform='matrix(1 0 0 -1 789 220)' fill='%23321017'/%3E%3Crect width='71' height='220' transform='matrix(1 0 0 -1 985 220)' fill='%23321017'/%3E%3Crect width='72' height='220' transform='matrix(1 0 0 -1 1084 220)' fill='%235F1B29'/%3E%3Crect width='72' height='220' transform='matrix(1 0 0 -1 1179 220)' fill='%233D0F19'/%3E%3C/svg%3E%0A" alt="" />
 		</div>
 	</div>
 
diff --git src/wp-admin/edit-link-form.php src/wp-admin/edit-link-form.php
index d2733282c0..2530cdb93a 100644
--- src/wp-admin/edit-link-form.php
+++ src/wp-admin/edit-link-form.php
@@ -67,7 +67,7 @@ get_current_screen()->add_help_tab(
 		'content' =>
 		'<p>' . __( 'You can add or edit links on this screen by entering information in each of the boxes. Only the link&#8217;s web address and name (the text you want to display on your site as the link) are required fields.' ) . '</p>' .
 		'<p>' . __( 'The boxes for link name, web address, and description have fixed positions, while the others may be repositioned using drag and drop. You can also hide boxes you don&#8217;t use in the Screen Options tab, or minimize boxes by clicking on the title bar of the box.' ) . '</p>' .
-		'<p>' . __( 'XFN stands for <a href="http://gmpg.org/xfn/">XHTML Friends Network</a>, which is optional. WordPress allows the generation of XFN attributes to show how you are related to the authors/owners of the site to which you are linking.' ) . '</p>',
+		'<p>' . __( 'XFN stands for <a href="https://gmpg.org/xfn/">XHTML Friends Network</a>, which is optional. WordPress allows the generation of XFN attributes to show how you are related to the authors/owners of the site to which you are linking.' ) . '</p>',
 	)
 );
 
@@ -122,7 +122,7 @@ wp_nonce_field( 'meta-box-order', 'meta-box-order-nonce', false );
 <h2><label for="link_url"><?php _e( 'Web Address' ); ?></label></h2>
 <div class="inside">
 	<input type="text" name="link_url" size="30" maxlength="255" class="code" value="<?php echo esc_attr( $link->link_url ); ?>" id="link_url" />
-	<p><?php _e( 'Example: <code>http://wordpress.org/</code> &#8212; don&#8217;t forget the <code>http://</code>' ); ?></p>
+	<p><?php _e( 'Example: <code>https://wordpress.org/</code> &#8212; don&#8217;t forget the <code>http://</code>' ); ?></p>
 </div>
 </div>
 
diff --git src/wp-admin/includes/class-wp-theme-install-list-table.php src/wp-admin/includes/class-wp-theme-install-list-table.php
index 04594edaa0..88fbf8f061 100644
--- src/wp-admin/includes/class-wp-theme-install-list-table.php
+++ src/wp-admin/includes/class-wp-theme-install-list-table.php
@@ -250,7 +250,7 @@ class WP_Theme_Install_List_Table extends WP_Themes_List_Table {
 	 *     @type string $slug           Theme slug, e.g. 'twentytwenty'.
 	 *     @type string $version        Theme version, e.g. '1.1'.
 	 *     @type string $author         Theme author username, e.g. 'melchoyce'.
-	 *     @type string $preview_url    Preview URL, e.g. 'http://2020.wordpress.net/'.
+	 *     @type string $preview_url    Preview URL, e.g. 'https://2020.wordpress.net/'.
 	 *     @type string $screenshot_url Screenshot URL, e.g. 'https://wordpress.org/themes/twentytwenty/'.
 	 *     @type float  $rating         Rating score.
 	 *     @type int    $num_ratings    The number of ratings.
diff --git src/wp-admin/includes/export.php src/wp-admin/includes/export.php
index 057e59f3dd..db3dd682e2 100644
--- src/wp-admin/includes/export.php
+++ src/wp-admin/includes/export.php
@@ -457,11 +457,11 @@ function export_wp( $args = array() ) {
 
 	<?php the_generator( 'export' ); ?>
 <rss version="2.0"
-	xmlns:excerpt="http://wordpress.org/export/<?php echo WXR_VERSION; ?>/excerpt/"
+	xmlns:excerpt="https://wordpress.org/export/<?php echo WXR_VERSION; ?>/excerpt/"
 	xmlns:content="http://purl.org/rss/1.0/modules/content/"
 	xmlns:wfw="http://wellformedweb.org/CommentAPI/"
 	xmlns:dc="http://purl.org/dc/elements/1.1/"
-	xmlns:wp="http://wordpress.org/export/<?php echo WXR_VERSION; ?>/"
+	xmlns:wp="https://wordpress.org/export/<?php echo WXR_VERSION; ?>/"
 >
 
 <channel>
diff --git src/wp-admin/includes/meta-boxes.php src/wp-admin/includes/meta-boxes.php
index 8e3ec6fb1c..8aeca12cf4 100644
--- src/wp-admin/includes/meta-boxes.php
+++ src/wp-admin/includes/meta-boxes.php
@@ -1213,110 +1213,110 @@ function link_xfn_meta_box( $link ) {
 	?>
 <table class="links-table">
 	<tr>
-		<th scope="row"><label for="link_rel"><?php /* translators: xfn: http://gmpg.org/xfn/ */ _e( 'rel:' ); ?></label></th>
+		<th scope="row"><label for="link_rel"><?php /* translators: xfn: https://gmpg.org/xfn/ */ _e( 'rel:' ); ?></label></th>
 		<td><input type="text" name="link_rel" id="link_rel" value="<?php echo ( isset( $link->link_rel ) ? esc_attr( $link->link_rel ) : '' ); ?>" /></td>
 	</tr>
 	<tr>
-		<th scope="row"><?php /* translators: xfn: http://gmpg.org/xfn/ */ _e( 'identity' ); ?></th>
-		<td><fieldset><legend class="screen-reader-text"><span><?php /* translators: xfn: http://gmpg.org/xfn/ */ _e( 'identity' ); ?></span></legend>
+		<th scope="row"><?php /* translators: xfn: https://gmpg.org/xfn/ */ _e( 'identity' ); ?></th>
+		<td><fieldset><legend class="screen-reader-text"><span><?php /* translators: xfn: https://gmpg.org/xfn/ */ _e( 'identity' ); ?></span></legend>
 			<label for="me">
 			<input type="checkbox" name="identity" value="me" id="me" <?php xfn_check( 'identity', 'me' ); ?> />
 			<?php _e( 'another web address of mine' ); ?></label>
 		</fieldset></td>
 	</tr>
 	<tr>
-		<th scope="row"><?php /* translators: xfn: http://gmpg.org/xfn/ */ _e( 'friendship' ); ?></th>
-		<td><fieldset><legend class="screen-reader-text"><span><?php /* translators: xfn: http://gmpg.org/xfn/ */ _e( 'friendship' ); ?></span></legend>
+		<th scope="row"><?php /* translators: xfn: https://gmpg.org/xfn/ */ _e( 'friendship' ); ?></th>
+		<td><fieldset><legend class="screen-reader-text"><span><?php /* translators: xfn: https://gmpg.org/xfn/ */ _e( 'friendship' ); ?></span></legend>
 			<label for="contact">
-			<input class="valinp" type="radio" name="friendship" value="contact" id="contact" <?php xfn_check( 'friendship', 'contact' ); ?> />&nbsp;<?php /* translators: xfn: http://gmpg.org/xfn/ */ _e( 'contact' ); ?>
+			<input class="valinp" type="radio" name="friendship" value="contact" id="contact" <?php xfn_check( 'friendship', 'contact' ); ?> />&nbsp;<?php /* translators: xfn: https://gmpg.org/xfn/ */ _e( 'contact' ); ?>
 			</label>
 			<label for="acquaintance">
-			<input class="valinp" type="radio" name="friendship" value="acquaintance" id="acquaintance" <?php xfn_check( 'friendship', 'acquaintance' ); ?> />&nbsp;<?php /* translators: xfn: http://gmpg.org/xfn/ */ _e( 'acquaintance' ); ?>
+			<input class="valinp" type="radio" name="friendship" value="acquaintance" id="acquaintance" <?php xfn_check( 'friendship', 'acquaintance' ); ?> />&nbsp;<?php /* translators: xfn: https://gmpg.org/xfn/ */ _e( 'acquaintance' ); ?>
 			</label>
 			<label for="friend">
-			<input class="valinp" type="radio" name="friendship" value="friend" id="friend" <?php xfn_check( 'friendship', 'friend' ); ?> />&nbsp;<?php /* translators: xfn: http://gmpg.org/xfn/ */ _e( 'friend' ); ?>
+			<input class="valinp" type="radio" name="friendship" value="friend" id="friend" <?php xfn_check( 'friendship', 'friend' ); ?> />&nbsp;<?php /* translators: xfn: https://gmpg.org/xfn/ */ _e( 'friend' ); ?>
 			</label>
 			<label for="friendship">
-			<input name="friendship" type="radio" class="valinp" value="" id="friendship" <?php xfn_check( 'friendship' ); ?> />&nbsp;<?php /* translators: xfn: http://gmpg.org/xfn/ */ _e( 'none' ); ?>
+			<input name="friendship" type="radio" class="valinp" value="" id="friendship" <?php xfn_check( 'friendship' ); ?> />&nbsp;<?php /* translators: xfn: https://gmpg.org/xfn/ */ _e( 'none' ); ?>
 			</label>
 		</fieldset></td>
 	</tr>
 	<tr>
-		<th scope="row"> <?php /* translators: xfn: http://gmpg.org/xfn/ */ _e( 'physical' ); ?> </th>
-		<td><fieldset><legend class="screen-reader-text"><span><?php /* translators: xfn: http://gmpg.org/xfn/ */ _e( 'physical' ); ?></span></legend>
+		<th scope="row"> <?php /* translators: xfn: https://gmpg.org/xfn/ */ _e( 'physical' ); ?> </th>
+		<td><fieldset><legend class="screen-reader-text"><span><?php /* translators: xfn: https://gmpg.org/xfn/ */ _e( 'physical' ); ?></span></legend>
 			<label for="met">
-			<input class="valinp" type="checkbox" name="physical" value="met" id="met" <?php xfn_check( 'physical', 'met' ); ?> />&nbsp;<?php /* translators: xfn: http://gmpg.org/xfn/ */ _e( 'met' ); ?>
+			<input class="valinp" type="checkbox" name="physical" value="met" id="met" <?php xfn_check( 'physical', 'met' ); ?> />&nbsp;<?php /* translators: xfn: https://gmpg.org/xfn/ */ _e( 'met' ); ?>
 			</label>
 		</fieldset></td>
 	</tr>
 	<tr>
-		<th scope="row"> <?php /* translators: xfn: http://gmpg.org/xfn/ */ _e( 'professional' ); ?> </th>
-		<td><fieldset><legend class="screen-reader-text"><span><?php /* translators: xfn: http://gmpg.org/xfn/ */ _e( 'professional' ); ?></span></legend>
+		<th scope="row"> <?php /* translators: xfn: https://gmpg.org/xfn/ */ _e( 'professional' ); ?> </th>
+		<td><fieldset><legend class="screen-reader-text"><span><?php /* translators: xfn: https://gmpg.org/xfn/ */ _e( 'professional' ); ?></span></legend>
 			<label for="co-worker">
-			<input class="valinp" type="checkbox" name="professional" value="co-worker" id="co-worker" <?php xfn_check( 'professional', 'co-worker' ); ?> />&nbsp;<?php /* translators: xfn: http://gmpg.org/xfn/ */ _e( 'co-worker' ); ?>
+			<input class="valinp" type="checkbox" name="professional" value="co-worker" id="co-worker" <?php xfn_check( 'professional', 'co-worker' ); ?> />&nbsp;<?php /* translators: xfn: https://gmpg.org/xfn/ */ _e( 'co-worker' ); ?>
 			</label>
 			<label for="colleague">
-			<input class="valinp" type="checkbox" name="professional" value="colleague" id="colleague" <?php xfn_check( 'professional', 'colleague' ); ?> />&nbsp;<?php /* translators: xfn: http://gmpg.org/xfn/ */ _e( 'colleague' ); ?>
+			<input class="valinp" type="checkbox" name="professional" value="colleague" id="colleague" <?php xfn_check( 'professional', 'colleague' ); ?> />&nbsp;<?php /* translators: xfn: https://gmpg.org/xfn/ */ _e( 'colleague' ); ?>
 			</label>
 		</fieldset></td>
 	</tr>
 	<tr>
-		<th scope="row"><?php /* translators: xfn: http://gmpg.org/xfn/ */ _e( 'geographical' ); ?></th>
-		<td><fieldset><legend class="screen-reader-text"><span> <?php /* translators: xfn: http://gmpg.org/xfn/ */ _e( 'geographical' ); ?> </span></legend>
+		<th scope="row"><?php /* translators: xfn: https://gmpg.org/xfn/ */ _e( 'geographical' ); ?></th>
+		<td><fieldset><legend class="screen-reader-text"><span> <?php /* translators: xfn: https://gmpg.org/xfn/ */ _e( 'geographical' ); ?> </span></legend>
 			<label for="co-resident">
-			<input class="valinp" type="radio" name="geographical" value="co-resident" id="co-resident" <?php xfn_check( 'geographical', 'co-resident' ); ?> />&nbsp;<?php /* translators: xfn: http://gmpg.org/xfn/ */ _e( 'co-resident' ); ?>
+			<input class="valinp" type="radio" name="geographical" value="co-resident" id="co-resident" <?php xfn_check( 'geographical', 'co-resident' ); ?> />&nbsp;<?php /* translators: xfn: https://gmpg.org/xfn/ */ _e( 'co-resident' ); ?>
 			</label>
 			<label for="neighbor">
-			<input class="valinp" type="radio" name="geographical" value="neighbor" id="neighbor" <?php xfn_check( 'geographical', 'neighbor' ); ?> />&nbsp;<?php /* translators: xfn: http://gmpg.org/xfn/ */ _e( 'neighbor' ); ?>
+			<input class="valinp" type="radio" name="geographical" value="neighbor" id="neighbor" <?php xfn_check( 'geographical', 'neighbor' ); ?> />&nbsp;<?php /* translators: xfn: https://gmpg.org/xfn/ */ _e( 'neighbor' ); ?>
 			</label>
 			<label for="geographical">
-			<input class="valinp" type="radio" name="geographical" value="" id="geographical" <?php xfn_check( 'geographical' ); ?> />&nbsp;<?php /* translators: xfn: http://gmpg.org/xfn/ */ _e( 'none' ); ?>
+			<input class="valinp" type="radio" name="geographical" value="" id="geographical" <?php xfn_check( 'geographical' ); ?> />&nbsp;<?php /* translators: xfn: https://gmpg.org/xfn/ */ _e( 'none' ); ?>
 			</label>
 		</fieldset></td>
 	</tr>
 	<tr>
-		<th scope="row"><?php /* translators: xfn: http://gmpg.org/xfn/ */ _e( 'family' ); ?></th>
-		<td><fieldset><legend class="screen-reader-text"><span> <?php /* translators: xfn: http://gmpg.org/xfn/ */ _e( 'family' ); ?> </span></legend>
+		<th scope="row"><?php /* translators: xfn: https://gmpg.org/xfn/ */ _e( 'family' ); ?></th>
+		<td><fieldset><legend class="screen-reader-text"><span> <?php /* translators: xfn: https://gmpg.org/xfn/ */ _e( 'family' ); ?> </span></legend>
 			<label for="child">
-			<input class="valinp" type="radio" name="family" value="child" id="child" <?php xfn_check( 'family', 'child' ); ?> />&nbsp;<?php /* translators: xfn: http://gmpg.org/xfn/ */ _e( 'child' ); ?>
+			<input class="valinp" type="radio" name="family" value="child" id="child" <?php xfn_check( 'family', 'child' ); ?> />&nbsp;<?php /* translators: xfn: https://gmpg.org/xfn/ */ _e( 'child' ); ?>
 			</label>
 			<label for="kin">
-			<input class="valinp" type="radio" name="family" value="kin" id="kin" <?php xfn_check( 'family', 'kin' ); ?> />&nbsp;<?php /* translators: xfn: http://gmpg.org/xfn/ */ _e( 'kin' ); ?>
+			<input class="valinp" type="radio" name="family" value="kin" id="kin" <?php xfn_check( 'family', 'kin' ); ?> />&nbsp;<?php /* translators: xfn: https://gmpg.org/xfn/ */ _e( 'kin' ); ?>
 			</label>
 			<label for="parent">
-			<input class="valinp" type="radio" name="family" value="parent" id="parent" <?php xfn_check( 'family', 'parent' ); ?> />&nbsp;<?php /* translators: xfn: http://gmpg.org/xfn/ */ _e( 'parent' ); ?>
+			<input class="valinp" type="radio" name="family" value="parent" id="parent" <?php xfn_check( 'family', 'parent' ); ?> />&nbsp;<?php /* translators: xfn: https://gmpg.org/xfn/ */ _e( 'parent' ); ?>
 			</label>
 			<label for="sibling">
-			<input class="valinp" type="radio" name="family" value="sibling" id="sibling" <?php xfn_check( 'family', 'sibling' ); ?> />&nbsp;<?php /* translators: xfn: http://gmpg.org/xfn/ */ _e( 'sibling' ); ?>
+			<input class="valinp" type="radio" name="family" value="sibling" id="sibling" <?php xfn_check( 'family', 'sibling' ); ?> />&nbsp;<?php /* translators: xfn: https://gmpg.org/xfn/ */ _e( 'sibling' ); ?>
 			</label>
 			<label for="spouse">
-			<input class="valinp" type="radio" name="family" value="spouse" id="spouse" <?php xfn_check( 'family', 'spouse' ); ?> />&nbsp;<?php /* translators: xfn: http://gmpg.org/xfn/ */ _e( 'spouse' ); ?>
+			<input class="valinp" type="radio" name="family" value="spouse" id="spouse" <?php xfn_check( 'family', 'spouse' ); ?> />&nbsp;<?php /* translators: xfn: https://gmpg.org/xfn/ */ _e( 'spouse' ); ?>
 			</label>
 			<label for="family">
-			<input class="valinp" type="radio" name="family" value="" id="family" <?php xfn_check( 'family' ); ?> />&nbsp;<?php /* translators: xfn: http://gmpg.org/xfn/ */ _e( 'none' ); ?>
+			<input class="valinp" type="radio" name="family" value="" id="family" <?php xfn_check( 'family' ); ?> />&nbsp;<?php /* translators: xfn: https://gmpg.org/xfn/ */ _e( 'none' ); ?>
 			</label>
 		</fieldset></td>
 	</tr>
 	<tr>
-		<th scope="row"><?php /* translators: xfn: http://gmpg.org/xfn/ */ _e( 'romantic' ); ?></th>
-		<td><fieldset><legend class="screen-reader-text"><span> <?php /* translators: xfn: http://gmpg.org/xfn/ */ _e( 'romantic' ); ?> </span></legend>
+		<th scope="row"><?php /* translators: xfn: https://gmpg.org/xfn/ */ _e( 'romantic' ); ?></th>
+		<td><fieldset><legend class="screen-reader-text"><span> <?php /* translators: xfn: https://gmpg.org/xfn/ */ _e( 'romantic' ); ?> </span></legend>
 			<label for="muse">
-			<input class="valinp" type="checkbox" name="romantic" value="muse" id="muse" <?php xfn_check( 'romantic', 'muse' ); ?> />&nbsp;<?php /* translators: xfn: http://gmpg.org/xfn/ */ _e( 'muse' ); ?>
+			<input class="valinp" type="checkbox" name="romantic" value="muse" id="muse" <?php xfn_check( 'romantic', 'muse' ); ?> />&nbsp;<?php /* translators: xfn: https://gmpg.org/xfn/ */ _e( 'muse' ); ?>
 			</label>
 			<label for="crush">
-			<input class="valinp" type="checkbox" name="romantic" value="crush" id="crush" <?php xfn_check( 'romantic', 'crush' ); ?> />&nbsp;<?php /* translators: xfn: http://gmpg.org/xfn/ */ _e( 'crush' ); ?>
+			<input class="valinp" type="checkbox" name="romantic" value="crush" id="crush" <?php xfn_check( 'romantic', 'crush' ); ?> />&nbsp;<?php /* translators: xfn: https://gmpg.org/xfn/ */ _e( 'crush' ); ?>
 			</label>
 			<label for="date">
-			<input class="valinp" type="checkbox" name="romantic" value="date" id="date" <?php xfn_check( 'romantic', 'date' ); ?> />&nbsp;<?php /* translators: xfn: http://gmpg.org/xfn/ */ _e( 'date' ); ?>
+			<input class="valinp" type="checkbox" name="romantic" value="date" id="date" <?php xfn_check( 'romantic', 'date' ); ?> />&nbsp;<?php /* translators: xfn: https://gmpg.org/xfn/ */ _e( 'date' ); ?>
 			</label>
 			<label for="romantic">
-			<input class="valinp" type="checkbox" name="romantic" value="sweetheart" id="romantic" <?php xfn_check( 'romantic', 'sweetheart' ); ?> />&nbsp;<?php /* translators: xfn: http://gmpg.org/xfn/ */ _e( 'sweetheart' ); ?>
+			<input class="valinp" type="checkbox" name="romantic" value="sweetheart" id="romantic" <?php xfn_check( 'romantic', 'sweetheart' ); ?> />&nbsp;<?php /* translators: xfn: https://gmpg.org/xfn/ */ _e( 'sweetheart' ); ?>
 			</label>
 		</fieldset></td>
 	</tr>
 
 </table>
-<p><?php _e( 'If the link is to a person, you can specify your relationship with them using the above form. If you would like to learn more about the idea check out <a href="http://gmpg.org/xfn/">XFN</a>.' ); ?></p>
+<p><?php _e( 'If the link is to a person, you can specify your relationship with them using the above form. If you would like to learn more about the idea check out <a href="https://gmpg.org/xfn/">XFN</a>.' ); ?></p>
 	<?php
 }
 
diff --git src/wp-admin/includes/template.php src/wp-admin/includes/template.php
index a6f74722cf..beba775da1 100644
--- src/wp-admin/includes/template.php
+++ src/wp-admin/includes/template.php
@@ -2425,7 +2425,7 @@ function _wp_admin_html_begin() {
 	?>
 <!DOCTYPE html>
 <!--[if IE 8]>
-<html xmlns="http://www.w3.org/1999/xhtml" class="ie8 <?php echo $admin_html_class; ?>"
+<html xmlns="https://www.w3.org/1999/xhtml" class="ie8 <?php echo $admin_html_class; ?>"
 	<?php
 	/**
 	 * Fires inside the HTML tag in the admin header.
@@ -2439,7 +2439,7 @@ function _wp_admin_html_begin() {
 	>
 <![endif]-->
 <!--[if !(IE 8) ]><!-->
-<html xmlns="http://www.w3.org/1999/xhtml" class="<?php echo $admin_html_class; ?>"
+<html xmlns="https://www.w3.org/1999/xhtml" class="<?php echo $admin_html_class; ?>"
 	<?php
 	/** This action is documented in wp-admin/includes/template.php */
 	do_action( 'admin_xml_ns' );
diff --git src/wp-admin/install.php src/wp-admin/install.php
index 2168c03e18..8ebf934118 100644
--- src/wp-admin/install.php
+++ src/wp-admin/install.php
@@ -10,7 +10,7 @@
 if ( false ) {
 	?>
 <!DOCTYPE html>
-<html xmlns="http://www.w3.org/1999/xhtml">
+<html xmlns="https://www.w3.org/1999/xhtml">
 <head>
 	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 	<title>Error: PHP is not running</title>
@@ -65,7 +65,7 @@ function display_header( $body_classes = '' ) {
 	}
 	?>
 <!DOCTYPE html>
-<html xmlns="http://www.w3.org/1999/xhtml" <?php language_attributes(); ?>>
+<html xmlns="https://www.w3.org/1999/xhtml" <?php language_attributes(); ?>>
 <head>
 	<meta name="viewport" content="width=device-width" />
 	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
diff --git src/wp-admin/maint/repair.php src/wp-admin/maint/repair.php
index e6bc2418da..f5e99df2a5 100644
--- src/wp-admin/maint/repair.php
+++ src/wp-admin/maint/repair.php
@@ -12,7 +12,7 @@ require_once dirname( dirname( __DIR__ ) ) . '/wp-load.php';
 header( 'Content-Type: text/html; charset=utf-8' );
 ?>
 <!DOCTYPE html>
-<html xmlns="http://www.w3.org/1999/xhtml" <?php language_attributes(); ?>>
+<html xmlns="https://www.w3.org/1999/xhtml" <?php language_attributes(); ?>>
 <head>
 	<meta name="viewport" content="width=device-width" />
 	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
diff --git src/wp-admin/setup-config.php src/wp-admin/setup-config.php
index 7b38b9f412..b29399263f 100644
--- src/wp-admin/setup-config.php
+++ src/wp-admin/setup-config.php
@@ -104,7 +104,7 @@ function setup_config_display_header( $body_classes = array() ) {
 	header( 'Content-Type: text/html; charset=utf-8' );
 	?>
 <!DOCTYPE html>
-<html xmlns="http://www.w3.org/1999/xhtml"<?php echo $dir_attr; ?>>
+<html xmlns="https://www.w3.org/1999/xhtml"<?php echo $dir_attr; ?>>
 <head>
 	<meta name="viewport" content="width=device-width" />
 	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
diff --git src/wp-admin/site-health-info.php src/wp-admin/site-health-info.php
index 53b336074d..27d0a60719 100644
--- src/wp-admin/site-health-info.php
+++ src/wp-admin/site-health-info.php
@@ -38,7 +38,7 @@ require_once ABSPATH . 'wp-admin/admin-header.php';
 
 	<div class="health-check-title-section site-health-progress-wrapper loading hide-if-no-js">
 		<div class="site-health-progress">
-			<svg role="img" aria-hidden="true" focusable="false" width="100%" height="100%" viewBox="0 0 200 200" version="1.1" xmlns="http://www.w3.org/2000/svg">
+			<svg role="img" aria-hidden="true" focusable="false" width="100%" height="100%" viewBox="0 0 200 200" version="1.1" xmlns="https://www.w3.org/2000/svg">
 				<circle r="90" cx="100" cy="100" fill="transparent" stroke-dasharray="565.48" stroke-dashoffset="0"></circle>
 				<circle id="bar" r="90" cx="100" cy="100" fill="transparent" stroke-dasharray="565.48" stroke-dashoffset="0"></circle>
 			</svg>
diff --git src/wp-admin/site-health.php src/wp-admin/site-health.php
index fb0d5c60f1..673eb3a6fb 100644
--- src/wp-admin/site-health.php
+++ src/wp-admin/site-health.php
@@ -43,7 +43,7 @@ require_once ABSPATH . 'wp-admin/admin-header.php';
 
 	<div class="health-check-title-section site-health-progress-wrapper loading hide-if-no-js">
 		<div class="site-health-progress">
-			<svg role="img" aria-hidden="true" focusable="false" width="100%" height="100%" viewBox="0 0 200 200" version="1.1" xmlns="http://www.w3.org/2000/svg">
+			<svg role="img" aria-hidden="true" focusable="false" width="100%" height="100%" viewBox="0 0 200 200" version="1.1" xmlns="https://www.w3.org/2000/svg">
 				<circle r="90" cx="100" cy="100" fill="transparent" stroke-dasharray="565.48" stroke-dashoffset="0"></circle>
 				<circle id="bar" r="90" cx="100" cy="100" fill="transparent" stroke-dasharray="565.48" stroke-dashoffset="0"></circle>
 			</svg>
diff --git src/wp-admin/upgrade.php src/wp-admin/upgrade.php
index 2d27f50c21..783b78657b 100644
--- src/wp-admin/upgrade.php
+++ src/wp-admin/upgrade.php
@@ -56,7 +56,7 @@ if ( file_exists( WP_CONTENT_DIR . '/db.php' ) && empty( $wpdb->is_mysql ) ) {
 header( 'Content-Type: ' . get_option( 'html_type' ) . '; charset=' . get_option( 'blog_charset' ) );
 ?>
 <!DOCTYPE html>
-<html xmlns="http://www.w3.org/1999/xhtml" <?php language_attributes(); ?>>
+<html xmlns="https://www.w3.org/1999/xhtml" <?php language_attributes(); ?>>
 <head>
 	<meta name="viewport" content="width=device-width" />
 	<meta http-equiv="Content-Type" content="<?php bloginfo( 'html_type' ); ?>; charset=<?php echo get_option( 'blog_charset' ); ?>" />
diff --git src/wp-content/themes/twentyeleven/header.php src/wp-content/themes/twentyeleven/header.php
index d8afc3b577..fef07db6bb 100644
--- src/wp-content/themes/twentyeleven/header.php
+++ src/wp-content/themes/twentyeleven/header.php
@@ -48,7 +48,7 @@ if ( ( $paged >= 2 || $page >= 2 ) && ! is_404() ) {
 
 ?>
 	</title>
-<link rel="profile" href="http://gmpg.org/xfn/11" />
+<link rel="profile" href="https://gmpg.org/xfn/11" />
 <link rel="stylesheet" type="text/css" media="all" href="<?php bloginfo( 'stylesheet_url' ); ?>?ver=20190507" />
 <link rel="pingback" href="<?php echo esc_url( get_bloginfo( 'pingback_url' ) ); ?>">
 <!--[if lt IE 9]>
diff --git src/wp-content/themes/twentyfifteen/header.php src/wp-content/themes/twentyfifteen/header.php
index 5ad5051877..614cca89e2 100644
--- src/wp-content/themes/twentyfifteen/header.php
+++ src/wp-content/themes/twentyfifteen/header.php
@@ -13,7 +13,7 @@
 <head>
 	<meta charset="<?php bloginfo( 'charset' ); ?>">
 	<meta name="viewport" content="width=device-width">
-	<link rel="profile" href="http://gmpg.org/xfn/11">
+	<link rel="profile" href="https://gmpg.org/xfn/11">
 	<link rel="pingback" href="<?php echo esc_url( get_bloginfo( 'pingback_url' ) ); ?>">
 	<!--[if lt IE 9]>
 	<script src="<?php echo esc_url( get_template_directory_uri() ); ?>/js/html5.js?ver=3.7.0"></script>
diff --git src/wp-content/themes/twentyfourteen/header.php src/wp-content/themes/twentyfourteen/header.php
index 21d1a546cb..4bedca640f 100644
--- src/wp-content/themes/twentyfourteen/header.php
+++ src/wp-content/themes/twentyfourteen/header.php
@@ -22,7 +22,7 @@
 	<meta charset="<?php bloginfo( 'charset' ); ?>">
 	<meta name="viewport" content="width=device-width">
 	<title><?php wp_title( '|', true, 'right' ); ?></title>
-	<link rel="profile" href="http://gmpg.org/xfn/11">
+	<link rel="profile" href="https://gmpg.org/xfn/11">
 	<link rel="pingback" href="<?php echo esc_url( get_bloginfo( 'pingback_url' ) ); ?>">
 	<!--[if lt IE 9]>
 	<script src="<?php echo get_template_directory_uri(); ?>/js/html5.js?ver=3.7.0"></script>
diff --git src/wp-content/themes/twentyseventeen/header.php src/wp-content/themes/twentyseventeen/header.php
index 9ea7aa5be8..c041fd0779 100644
--- src/wp-content/themes/twentyseventeen/header.php
+++ src/wp-content/themes/twentyseventeen/header.php
@@ -17,7 +17,7 @@
 <head>
 <meta charset="<?php bloginfo( 'charset' ); ?>">
 <meta name="viewport" content="width=device-width, initial-scale=1">
-<link rel="profile" href="http://gmpg.org/xfn/11">
+<link rel="profile" href="https://gmpg.org/xfn/11">
 
 <?php wp_head(); ?>
 </head>
diff --git src/wp-content/themes/twentysixteen/header.php src/wp-content/themes/twentysixteen/header.php
index a5cfee6a47..28c587857b 100644
--- src/wp-content/themes/twentysixteen/header.php
+++ src/wp-content/themes/twentysixteen/header.php
@@ -14,7 +14,7 @@
 <head>
 	<meta charset="<?php bloginfo( 'charset' ); ?>">
 	<meta name="viewport" content="width=device-width, initial-scale=1">
-	<link rel="profile" href="http://gmpg.org/xfn/11">
+	<link rel="profile" href="https://gmpg.org/xfn/11">
 	<?php if ( is_singular() && pings_open( get_queried_object() ) ) : ?>
 	<link rel="pingback" href="<?php echo esc_url( get_bloginfo( 'pingback_url' ) ); ?>">
 	<?php endif; ?>
diff --git src/wp-content/themes/twentyten/header.php src/wp-content/themes/twentyten/header.php
index 0349d0489c..17dd16c7a5 100644
--- src/wp-content/themes/twentyten/header.php
+++ src/wp-content/themes/twentyten/header.php
@@ -38,7 +38,7 @@ if ( ( $paged >= 2 || $page >= 2 ) && ! is_404() ) {
 
 ?>
 	</title>
-<link rel="profile" href="http://gmpg.org/xfn/11" />
+<link rel="profile" href="https://gmpg.org/xfn/11" />
 <link rel="stylesheet" type="text/css" media="all" href="<?php bloginfo( 'stylesheet_url' ); ?>?ver=20190507" />
 <link rel="pingback" href="<?php echo esc_url( get_bloginfo( 'pingback_url' ) ); ?>">
 <?php
diff --git src/wp-content/themes/twentythirteen/header.php src/wp-content/themes/twentythirteen/header.php
index 92c54e94ad..7fdf9c791b 100644
--- src/wp-content/themes/twentythirteen/header.php
+++ src/wp-content/themes/twentythirteen/header.php
@@ -22,7 +22,7 @@
 	<meta charset="<?php bloginfo( 'charset' ); ?>">
 	<meta name="viewport" content="width=device-width">
 	<title><?php wp_title( '|', true, 'right' ); ?></title>
-	<link rel="profile" href="http://gmpg.org/xfn/11">
+	<link rel="profile" href="https://gmpg.org/xfn/11">
 	<link rel="pingback" href="<?php echo esc_url( get_bloginfo( 'pingback_url' ) ); ?>">
 	<!--[if lt IE 9]>
 	<script src="<?php echo get_template_directory_uri(); ?>/js/html5.js?ver=3.7.0"></script>
diff --git src/wp-content/themes/twentytwelve/header.php src/wp-content/themes/twentytwelve/header.php
index 2888cd8ee3..8f15a76176 100644
--- src/wp-content/themes/twentytwelve/header.php
+++ src/wp-content/themes/twentytwelve/header.php
@@ -22,7 +22,7 @@
 <meta charset="<?php bloginfo( 'charset' ); ?>" />
 <meta name="viewport" content="width=device-width" />
 <title><?php wp_title( '|', true, 'right' ); ?></title>
-<link rel="profile" href="http://gmpg.org/xfn/11" />
+<link rel="profile" href="https://gmpg.org/xfn/11" />
 <link rel="pingback" href="<?php echo esc_url( get_bloginfo( 'pingback_url' ) ); ?>">
 <?php // Loads HTML5 JavaScript file to add support for HTML5 elements in older IE versions. ?>
 <!--[if lt IE 9]>
diff --git src/wp-includes/theme-compat/header.php src/wp-includes/theme-compat/header.php
index 9aef7e98c0..19d08bae55 100644
--- src/wp-includes/theme-compat/header.php
+++ src/wp-includes/theme-compat/header.php
@@ -16,9 +16,9 @@ _deprecated_file(
 );
 ?>
 <!DOCTYPE html>
-<html xmlns="http://www.w3.org/1999/xhtml" <?php language_attributes(); ?>>
+<html xmlns="https://www.w3.org/1999/xhtml" <?php language_attributes(); ?>>
 <head>
-<link rel="profile" href="http://gmpg.org/xfn/11" />
+<link rel="profile" href="https://gmpg.org/xfn/11" />
 <meta http-equiv="Content-Type" content="<?php bloginfo( 'html_type' ); ?>; charset=<?php bloginfo( 'charset' ); ?>" />
 
 <title><?php echo wp_get_document_title(); ?></title>
