Index: src/wp-content/themes/twentynineteen/archive.php
===================================================================
--- src/wp-content/themes/twentynineteen/archive.php	(revision 43945)
+++ src/wp-content/themes/twentynineteen/archive.php	(working copy)
@@ -20,8 +20,6 @@
 			<header class="page-header">
 				<?php
 					the_archive_title( '<h1 class="page-title">', '</h1>' );
-					// Remove for now @TODO
-					// the_archive_description( '<div class="page-description">', '</div>' );
 				?>
 			</header><!-- .page-header -->
 
Index: src/wp-content/themes/twentynineteen/classes/class-twentynineteen-svg-icons.php
===================================================================
--- src/wp-content/themes/twentynineteen/classes/class-twentynineteen-svg-icons.php	(revision 43945)
+++ src/wp-content/themes/twentynineteen/classes/class-twentynineteen-svg-icons.php	(working copy)
@@ -205,16 +205,16 @@
 			'facebook.com',
 			'fb.me',
 		),
-		'feed'    => array(
+		'feed'        => array(
 			'feed',
 		),
 		'google-plus' => array(
 			'plus.google.com',
 		),
-		'lastfm'   => array(
+		'lastfm'      => array(
 			'last.fm',
 		),
-		'mail'   => array(
+		'mail'        => array(
 			'mailto:',
 		),
 		'slideshare'  => array(
Index: src/wp-content/themes/twentynineteen/functions.php
===================================================================
--- src/wp-content/themes/twentynineteen/functions.php	(revision 43945)
+++ src/wp-content/themes/twentynineteen/functions.php	(working copy)
@@ -263,14 +263,13 @@
 
 	require_once get_parent_theme_file_path( '/inc/color-patterns.php' );
 
-	if ( 'default' === get_theme_mod( 'primary_color', 'default' ) ) {
-		$primary_color = 199;
-	} else {
-		$primary_color = absint( get_theme_mod( 'primary_color_hue', 199 ) );
+	$primary_color = 199;
+	if ( 'default' !== get_theme_mod( 'primary_color', 'default' ) ) {
+		$primary_color = get_theme_mod( 'primary_color_hue', 199 );
 	}
 	?>
 
-	<style type="text/css" id="custom-theme-colors" <?php echo is_customize_preview() ? 'data-hue="' . $primary_color . '"' : ''; ?>>
+	<style type="text/css" id="custom-theme-colors" <?php echo is_customize_preview() ? 'data-hue="' . absint( $primary_color ) . '"' : ''; ?>>
 		<?php echo twentynineteen_custom_colors_css(); ?>
 	</style>
 	<?php
Index: src/wp-content/themes/twentynineteen/header.php
===================================================================
--- src/wp-content/themes/twentynineteen/header.php	(revision 43945)
+++ src/wp-content/themes/twentynineteen/header.php	(working copy)
@@ -31,10 +31,17 @@
 
 			<?php if ( is_singular() && twentynineteen_can_show_post_thumbnail() ) : ?>
 				<div class="site-featured-image">
-					<?php twentynineteen_post_thumbnail(); ?>
-					<?php the_post(); ?>
-					<?php $discussion = ! is_page() && twentynineteen_can_show_post_thumbnail() ? twentynineteen_get_discussion_data() : null; ?>
-					<div class="<?php echo ( ! empty( $discussion ) && count( $discussion->responses ) > 0 ) ? 'entry-header has-discussion' : 'entry-header'; ?>">
+					<?php
+						twentynineteen_post_thumbnail();
+						the_post();
+						$discussion = ! is_page() && twentynineteen_can_show_post_thumbnail() ? twentynineteen_get_discussion_data() : null;
+
+						$classes = 'entry-header';
+						if ( ! empty( $discussion ) && count( $discussion->responses ) > 0 ) {
+							$classes = 'entry-header has-discussion';
+						}
+					?>
+					<div class="<?php echo $classes; ?>">
 						<?php get_template_part( 'template-parts/header/entry', 'header' ); ?>
 					</div><!-- .entry-header -->
 					<?php rewind_posts(); ?>
Index: src/wp-content/themes/twentynineteen/image.php
===================================================================
--- src/wp-content/themes/twentynineteen/image.php	(revision 43945)
+++ src/wp-content/themes/twentynineteen/image.php	(working copy)
@@ -41,7 +41,7 @@
 								echo wp_get_attachment_image( get_the_ID(), $image_size );
 							?>
 
-							<figcaption class="wp-caption-text"><?php echo get_the_excerpt(); ?></figcaption>
+							<figcaption class="wp-caption-text"><?php the_excerpt(); ?></figcaption>
 
 						</figure><!-- .entry-attachment -->
 
Index: src/wp-content/themes/twentynineteen/inc/color-patterns.php
===================================================================
--- src/wp-content/themes/twentynineteen/inc/color-patterns.php	(revision 43945)
+++ src/wp-content/themes/twentynineteen/inc/color-patterns.php	(working copy)
@@ -12,10 +12,9 @@
  */
 function twentynineteen_custom_colors_css() {
 
-	if ( 'default' === get_theme_mod( 'primary_color', 'default' ) ) {
-		$primary_color = 199;
-	} else {
-		$primary_color = absint( get_theme_mod( 'primary_color_hue', 199 ) );
+	$primary_color = 199;
+	if ( 'default' !== get_theme_mod( 'primary_color', 'default' ) ) {
+		$primary_color = absint( get_theme_mod( 'primary_color', 199 ) );
 	}
 
 	/**
@@ -25,21 +24,48 @@
 	 *
 	 * @param int $saturation Color saturation level.
 	 */
+	$saturation = apply_filters( 'twentynineteen_custom_colors_saturation', 100 );
+	$saturation = absint( $saturation ) . '%';
 
-	$saturation           = absint( apply_filters( 'twentynineteen_custom_colors_saturation', 100 ) );
-	$saturation           = $saturation . '%';
-
+	/**
+	 * Filter Twenty Nineteen default selection saturation level.
+	 *
+	 * @since Twenty Nineteen 1.0
+	 *
+	 * @param int $saturation_selection Selection color saturation level.
+	 */
 	$saturation_selection = absint( apply_filters( 'twentynineteen_custom_colors_saturation_selection', 50 ) );
 	$saturation_selection = $saturation_selection . '%';
 
-	$lightness            = absint( apply_filters( 'twentynineteen_custom_colors_lightness', 33 ) );
-	$lightness            = $lightness . '%';
+	/**
+	 * Filter Twenty Nineteen default lightness level.
+	 *
+	 * @since Twenty Nineteen 1.0
+	 *
+	 * @param int $lightness Color lightness level.
+	 */
+	$lightness = apply_filters( 'twentynineteen_custom_colors_lightness', 33 );
+	$lightness = absint( $lightness ) . '%';
 
-	$lightness_hover      = absint( apply_filters( 'twentynineteen_custom_colors_lightness_hover', 23 ) );
-	$lightness_hover      = $lightness_hover . '%';
+	/**
+	 * Filter Twenty Nineteen default hover lightness level.
+	 *
+	 * @since Twenty Nineteen 1.0
+	 *
+	 * @param int $lightness_hover Hover color lightness level.
+	 */
+	$lightness_hover = apply_filters( 'twentynineteen_custom_colors_lightness_hover', 23 );
+	$lightness_hover = absint( $lightness_hover ) . '%';
 
-	$lightness_selection  = absint( apply_filters( 'twentynineteen_custom_colors_lightness_selection', 90 ) );
-	$lightness_selection  = $lightness_selection . '%';
+	/**
+	 * Filter Twenty Nineteen default selection lightness level.
+	 *
+	 * @since Twenty Nineteen 1.0
+	 *
+	 * @param int $lightness_selection Selection color lightness level.
+	 */
+	$lightness_selection = apply_filters( 'twentynineteen_custom_colors_lightness_selection', 90 );
+	$lightness_selection = absint( $lightness_selection ) . '%';
 
 	$theme_css = '
 		/*
@@ -233,11 +259,9 @@
 			color: inherit;
 		}
 		';
-	$css = '';
+
 	if ( function_exists( 'register_block_type' ) && is_admin() ) {
-		$css .= $editor_css;
-	} else if ( ! is_admin() ) {
-		$css = $theme_css;
+		$theme_css = $editor_css;
 	}
 
 	/**
@@ -249,5 +273,5 @@
 	 * @param int    $primary_color The user's selected color hue.
 	 * @param string $saturation    Filtered theme color saturation level.
 	 */
-	return apply_filters( 'twentynineteen_custom_colors_css', $css, $primary_color, $saturation );
+	return apply_filters( 'twentynineteen_custom_colors_css', $theme_css, $primary_color, $saturation );
 }
Index: src/wp-content/themes/twentynineteen/inc/customizer.php
===================================================================
--- src/wp-content/themes/twentynineteen/inc/customizer.php	(revision 43945)
+++ src/wp-content/themes/twentynineteen/inc/customizer.php	(working copy)
@@ -125,7 +125,7 @@
  * Bind JS handlers to instantly live-preview changes.
  */
 function twentynineteen_customize_preview_js() {
-	wp_enqueue_script( 'twentynineteen-customize-preview', get_theme_file_uri( '/js/customize-preview.js' ), array( 'customize-preview' ), '20151215', true );
+	wp_enqueue_script( 'twentynineteen-customize-preview', get_theme_file_uri( '/js/customize-preview.js' ), array( 'customize-preview' ), '20181108', true );
 }
 add_action( 'customize_preview_init', 'twentynineteen_customize_preview_js' );
 
@@ -133,7 +133,7 @@
  * Load dynamic logic for the customizer controls area.
  */
 function twentynineteen_panels_js() {
-	wp_enqueue_script( 'twentynineteen-customize-controls', get_theme_file_uri( '/js/customize-controls.js' ), array(), '1.0', true );
+	wp_enqueue_script( 'twentynineteen-customize-controls', get_theme_file_uri( '/js/customize-controls.js' ), array(), '20181031', true );
 }
 add_action( 'customize_controls_enqueue_scripts', 'twentynineteen_panels_js' );
 
Index: src/wp-content/themes/twentynineteen/inc/template-functions.php
===================================================================
--- src/wp-content/themes/twentynineteen/inc/template-functions.php	(revision 43945)
+++ src/wp-content/themes/twentynineteen/inc/template-functions.php	(working copy)
@@ -106,10 +106,7 @@
  * Returns true if image filters are enabled on the theme options.
  */
 function twentynineteen_image_filters_enabled() {
-	if ( get_theme_mod( 'image_filter', 1 ) ) {
-		return true;
-	}
-	return false;
+	return 'inactive' !== get_theme_mod( 'image_filter', 1 );
 }
 
 /**
@@ -418,8 +415,7 @@
 
 		return "#$r$g$b";
 
-	} else {
+	}
 
-		return "rgb($r, $g, $b)";
-	}
+	return "rgb($r, $g, $b)";
 }
Index: src/wp-content/themes/twentynineteen/inc/template-tags.php
===================================================================
--- src/wp-content/themes/twentynineteen/inc/template-tags.php	(revision 43945)
+++ src/wp-content/themes/twentynineteen/inc/template-tags.php	(working copy)
@@ -157,9 +157,7 @@
 
 		<figure class="post-thumbnail">
 			<a class="post-thumbnail-inner" href="<?php the_permalink(); ?>" aria-hidden="true" tabindex="-1">
-				<?php
-				the_post_thumbnail( 'post-thumbnail' );
-				?>
+				<?php the_post_thumbnail( 'post-thumbnail' ); ?>
 			</a>
 		</figure>
 
@@ -210,8 +208,8 @@
 
 			comment_form(
 				array(
-					'logged_in_as'       => null,
-					'title_reply'        => null,
+					'logged_in_as' => null,
+					'title_reply'  => null,
 				)
 			);
 		}
@@ -223,13 +221,19 @@
 	 * Documentation for function.
 	 */
 	function twentynineteen_the_posts_navigation() {
-		$prev_icon = twentynineteen_get_icon_svg( 'chevron_left', 22 );
-		$next_icon = twentynineteen_get_icon_svg( 'chevron_right', 22 );
 		the_posts_pagination(
 			array(
 				'mid_size'  => 2,
-				'prev_text' => sprintf( '%s <span class="nav-prev-text">%s</span>', $prev_icon, __( 'Newer posts', 'twentynineteen' ) ),
-				'next_text' => sprintf( '<span class="nav-next-text">%s</span> %s', __( 'Older posts', 'twentynineteen' ), $next_icon ),
+				'prev_text' => sprintf(
+					'%s <span class="nav-prev-text">%s</span>',
+					twentynineteen_get_icon_svg( 'chevron_left', 22 ),
+					__( 'Newer posts', 'twentynineteen' )
+				),
+				'next_text' => sprintf(
+					'<span class="nav-next-text">%s</span> %s',
+					__( 'Older posts', 'twentynineteen' ),
+					twentynineteen_get_icon_svg( 'chevron_right', 22 )
+				),
 			)
 		);
 	}
Index: src/wp-content/themes/twentynineteen/index.php
===================================================================
--- src/wp-content/themes/twentynineteen/index.php	(revision 43945)
+++ src/wp-content/themes/twentynineteen/index.php	(working copy)
@@ -39,7 +39,7 @@
 
 		}
 		?>
-		
+
 		</main><!-- .site-main -->
 	</section><!-- .content-area -->
 
Index: src/wp-content/themes/twentynineteen/sass/navigation/_menu-social-navigation.scss
===================================================================
--- src/wp-content/themes/twentynineteen/sass/navigation/_menu-social-navigation.scss	(revision 43945)
+++ src/wp-content/themes/twentynineteen/sass/navigation/_menu-social-navigation.scss	(working copy)
@@ -45,6 +45,9 @@
 					width: 32px;
 					height: 32px;
 
+					// Prevent icons from jumping in Safari using hardware acceleration.
+					transform: translateZ(0);
+
 					&#ui-icon-link {
 						transform: rotate(-45deg);
 					}
Index: src/wp-content/themes/twentynineteen/style-rtl.css
===================================================================
--- src/wp-content/themes/twentynineteen/style-rtl.css	(revision 43945)
+++ src/wp-content/themes/twentynineteen/style-rtl.css	(working copy)
@@ -1592,6 +1592,7 @@
   display: block;
   width: 32px;
   height: 32px;
+  transform: translateZ(0);
 }
 
 .social-navigation ul.social-links-menu li a svg#ui-icon-link {
Index: src/wp-content/themes/twentynineteen/style.css
===================================================================
--- src/wp-content/themes/twentynineteen/style.css	(revision 43945)
+++ src/wp-content/themes/twentynineteen/style.css	(working copy)
@@ -1592,6 +1592,7 @@
   display: block;
   width: 32px;
   height: 32px;
+  transform: translateZ(0);
 }
 
 .social-navigation ul.social-links-menu li a svg#ui-icon-link {