Use inline styles.

src/wp-admin/includes/admin-filters.php

@@ -60,7 +60,8 @@
 add_action( 'admin_print_scripts', 'print_emoji_detection_script' );
 add_action( 'admin_print_scripts', 'print_head_scripts', 20 );
 add_action( 'admin_print_footer_scripts', '_wp_footer_scripts' );
-add_action( 'admin_print_styles', 'print_emoji_styles' );
+add_action( 'admin_enqueue_scripts', 'wp_enqueue_emoji_styles' );
+add_action( 'admin_print_styles', 'print_emoji_styles' ); // Retained for backwards-compatibility. Unhooked by wp_enqueue_emoji_styles().
 add_action( 'admin_print_styles', 'print_admin_styles', 20 );
 
 add_action( 'admin_print_scripts-index.php', 'wp_localize_community_events' );

src/wp-includes/admin-bar.php

@@ -1224,33 +1224,37 @@ function wp_admin_bar_add_secondary_groups( $wp_admin_bar ) {
 	);
 }
 
+
+
 /**
- * Prints style and scripts for the admin bar.
+ * Remove the `wp_admin_bar_header` action and use `wp_add_inline_style` function to render inline styles.
  *
- * @since 3.1.0
+ * @since 6.4.0
  */
-function wp_admin_bar_header() {
-	$type_attr = current_theme_supports( 'html5', 'style' ) ? '' : ' type="text/css"';
-	?>
-<style<?php echo $type_attr; ?> media="print">#wpadminbar { display:none; }</style>
-	<?php
+function wp_enqueue_admin_bar_header_styles() {
+	$action = is_admin() ? 'admin_head' : 'wp_head';
+	if ( ! has_action( $action, 'wp_admin_bar_header' ) ) {
+		return;
+	}
+	remove_action( $action, 'wp_admin_bar_header' );
+	wp_add_inline_style( 'admin-bar', /* language=CSS */ '@media print { #wpadminbar { display:none; } }' );
 }
 
 /**
- * Prints default admin bar callback.
+ * Remove the `wp_head` action and use `wp_add_inline_style` function to render inline styles.
  *
- * @since 3.1.0
+ * @since 6.4.0
  */
-function _admin_bar_bump_cb() {
-	$type_attr = current_theme_supports( 'html5', 'style' ) ? '' : ' type="text/css"';
-	?>
-<style<?php echo $type_attr; ?> media="screen">
-	html { margin-top: 32px !important; }
-	@media screen and ( max-width: 782px ) {
-		html { margin-top: 46px !important; }
+function wp_enqueue_admin_bar_bump_styles() {
+	if ( ! has_action( 'wp_head', '_admin_bar_bump_cb' ) ) {
+		return;
 	}
-</style>
-	<?php
+	remove_action( 'wp_head', '_admin_bar_bump_cb' );
+	$css = /* language=CSS */ '
+		@media screen { html { margin-top: 32px !important; } }
+		@media screen and ( max-width: 782px ) { html { margin-top: 46px !important; } }
+	';
+	wp_add_inline_style( 'admin-bar', $css );
 }
 
 /**

src/wp-includes/default-filters.php

@@ -357,7 +357,8 @@
 add_action( 'start_previewing_theme', 'wp_clean_theme_json_cache' );
 add_action( 'after_switch_theme', '_wp_menus_changed' );
 add_action( 'after_switch_theme', '_wp_sidebars_changed' );
-add_action( 'wp_print_styles', 'print_emoji_styles' );
+add_action( 'wp_enqueue_scripts', 'wp_enqueue_emoji_styles' );
+add_action( 'wp_print_styles', 'print_emoji_styles' ); // Retained for backwards-compatibility. Unhooked by wp_enqueue_emoji_styles().
 
 if ( isset( $_GET['replytocom'] ) ) {
 	add_filter( 'wp_robots', 'wp_robots_no_robots' );
@@ -652,6 +653,9 @@
 // Don't remove. Wrong way to disable.
 add_action( 'template_redirect', '_wp_admin_bar_init', 0 );
 add_action( 'admin_init', '_wp_admin_bar_init' );
+add_action( 'wp_enqueue_scripts', 'wp_enqueue_admin_bar_bump_styles' );
+add_action( 'wp_enqueue_scripts', 'wp_enqueue_admin_bar_header_styles' );
+add_action( 'admin_enqueue_scripts', 'wp_enqueue_admin_bar_header_styles' );
 add_action( 'before_signup_header', '_wp_admin_bar_init' );
 add_action( 'activate_header', '_wp_admin_bar_init' );
 add_action( 'wp_body_open', 'wp_admin_bar_render', 0 );
@@ -673,7 +677,8 @@
 
 add_action( 'embed_head', 'enqueue_embed_scripts', 1 );
 add_action( 'embed_head', 'print_emoji_detection_script' );
-add_action( 'embed_head', 'print_embed_styles' );
+add_action( 'embed_head', 'wp_enqueue_embed_styles', 9 );
+add_action( 'embed_head', 'print_embed_styles' ); // Retained for backwards-compatibility. Unhooked by wp_enqueue_embed_styles().
 add_action( 'embed_head', 'wp_print_head_scripts', 20 );
 add_action( 'embed_head', 'wp_print_styles', 20 );
 add_action( 'embed_head', 'wp_robots' );

src/wp-includes/deprecated.php

@@ -5870,3 +5870,89 @@ function _wp_theme_json_webfonts_handler() {
 	add_action( 'wp_enqueue_scripts', $fn_generate_and_enqueue_styles );
 	add_action( 'admin_init', $fn_generate_and_enqueue_editor_styles );
 }
+
+/**
+ * Prints the CSS in the embed iframe header.
+ *
+ * @since 4.4.0
+ * @deprecated 6.4.0 Use wp_enqueue_embed_styles() instead.
+ */
+function print_embed_styles() {
+	_deprecated_function( __FUNCTION__, '6.4.0', 'wp_enqueue_embed_styles' );
+
+	$type_attr = current_theme_supports( 'html5', 'style' ) ? '' : ' type="text/css"';
+	$suffix    = SCRIPT_DEBUG ? '' : '.min';
+	?>
+	<style<?php echo $type_attr; ?>>
+		<?php echo file_get_contents( ABSPATH . WPINC . "/css/wp-embed-template$suffix.css" ); ?>
+	</style>
+	<?php
+}
+
+/**
+ * Prints the important emoji-related styles.
+ *
+ * @since 4.2.0
+ * @deprecated 6.4.0 Use wp_enqueue_emoji_styles() instead.
+ */
+function print_emoji_styles() {
+	_deprecated_function( __FUNCTION__, '6.4.0', 'wp_enqueue_emoji_styles' );
+	static $printed = false;
+
+	if ( $printed ) {
+		return;
+	}
+
+	$printed = true;
+
+	$type_attr = current_theme_supports( 'html5', 'style' ) ? '' : ' type="text/css"';
+	?>
+	<style<?php echo $type_attr; ?>>
+	img.wp-smiley,
+	img.emoji {
+		display: inline !important;
+		border: none !important;
+		box-shadow: none !important;
+		height: 1em !important;
+		width: 1em !important;
+		margin: 0 0.07em !important;
+		vertical-align: -0.1em !important;
+		background: none !important;
+		padding: 0 !important;
+	}
+	</style>
+	<?php
+}
+
+/**
+ * Prints style and scripts for the admin bar.
+ *
+ * @since 3.1.0
+ * @deprecated 6.4.0 Use wp_enqueue_admin_bar_header_styles() instead.
+ */
+function wp_admin_bar_header() {
+	_deprecated_function( __FUNCTION__, '6.4.0', 'wp_enqueue_admin_bar_header_styles' );
+	$type_attr = current_theme_supports( 'html5', 'style' ) ? '' : ' type="text/css"';
+	?>
+	<style<?php echo $type_attr; ?> media="print">#wpadminbar { display:none; }</style>
+	<?php
+}
+
+/**
+ * Prints default admin bar callback.
+ *
+ * @since 3.1.0
+ * @deprecated 6.4.0 Use wp_enqueue_admin_bar_bump_styles() instead.
+ */
+function _admin_bar_bump_cb() {
+	_deprecated_function( __FUNCTION__, '6.4.0', 'wp_enqueue_admin_bar_bump_styles' );
+	$type_attr = current_theme_supports( 'html5', 'style' ) ? '' : ' type="text/css"';
+	?>
+	<style<?php echo $type_attr; ?> media="screen">
+	html { margin-top: 32px !important; }
+	@media screen and ( max-width: 782px ) {
+	  html { margin-top: 46px !important; }
+	}
+	</style>
+	<?php
+}

src/wp-includes/embed.php

@@ -1059,18 +1059,20 @@ function enqueue_embed_scripts() {
 }
 
 /**
- * Prints the CSS in the embed iframe header.
+ * Enqueue the CSS in the embed iframe header.
  *
- * @since 4.4.0
+ * @since 6.4.0
  */
-function print_embed_styles() {
-	$type_attr = current_theme_supports( 'html5', 'style' ) ? '' : ' type="text/css"';
-	$suffix    = SCRIPT_DEBUG ? '' : '.min';
-	?>
-	<style<?php echo $type_attr; ?>>
-		<?php echo file_get_contents( ABSPATH . WPINC . "/css/wp-embed-template$suffix.css" ); ?>
-	</style>
-	<?php
+function wp_enqueue_embed_styles() {
+	if ( ! has_action( 'embed_head', 'print_embed_styles' ) ) {
+		return;
+	}
+	remove_action( 'embed_head', 'print_embed_styles' );
+	$suffix = wp_scripts_get_suffix();
+	$handle = 'wp-embed-template';
+	wp_register_style( $handle, false );
+	wp_add_inline_style( $handle, file_get_contents( ABSPATH . WPINC . "/css/wp-embed-template$suffix.css" ) );
+	wp_enqueue_style( $handle );
 }
 
 /**

src/wp-includes/formatting.php

@@ -5858,36 +5858,32 @@ function wp_spaces_regexp() {
 }
 
 /**
- * Prints the important emoji-related styles.
+ * Enqueue the important emoji-related styles.
  *
- * @since 4.2.0
+ * @since 6.4.0
  */
-function print_emoji_styles() {
-	static $printed = false;
-
-	if ( $printed ) {
+function wp_enqueue_emoji_styles() {
+	$action = is_admin() ? 'admin_print_styles' : 'wp_print_styles';
+	if ( ! has_action( $action, 'print_emoji_styles' ) ) {
 		return;
 	}
-
-	$printed = true;
-
-	$type_attr = current_theme_supports( 'html5', 'style' ) ? '' : ' type="text/css"';
-	?>
-<style<?php echo $type_attr; ?>>
-img.wp-smiley,
-img.emoji {
-	display: inline !important;
-	border: none !important;
-	box-shadow: none !important;
-	height: 1em !important;
-	width: 1em !important;
-	margin: 0 0.07em !important;
-	vertical-align: -0.1em !important;
-	background: none !important;
-	padding: 0 !important;
-}
-</style>
-	<?php
+	remove_action( $action, 'print_emoji_styles' );
+	$emoji_styles = /* language=CSS */ '
+	img.wp-smiley, img.emoji {
+		display: inline !important;
+		border: none !important;
+		box-shadow: none !important;
+		height: 1em !important;
+		width: 1em !important;
+		margin: 0 0.07em !important;
+		vertical-align: -0.1em !important;
+		background: none !important;
+		padding: 0 !important;
+	}';
+	$handle       = 'wp-emoji-styles';
+	wp_register_style( $handle, false );
+	wp_add_inline_style( $handle, $emoji_styles );
+	wp_enqueue_style( $handle );
 }
 
 /**

src/wp-includes/theme-templates.php

@@ -118,14 +118,8 @@ function the_block_template_skip_link() {
 	if ( ! $_wp_current_template_content ) {
 		return;
 	}
-	?>
 
-	<?php
-	/**
-	 * Print the skip-link styles.
-	 */
-	?>
-	<style id="skip-link-styles">
+	$skip_link_styles = /* language=CSS */ '
 		.skip-link.screen-reader-text {
 			border: 0;
 			clip: rect(1px,1px,1px,1px);
@@ -154,8 +148,15 @@ function the_block_template_skip_link() {
 			top: 5px;
 			width: auto;
 			z-index: 100000;
-		}
-	</style>
+		}';
+
+	$handle = 'wp-block-template-skip-link';
+
+	wp_register_style( $handle, false );
+	wp_add_inline_style( $handle, $skip_link_styles );
+	wp_enqueue_style( $handle );
+	?>
+
 	<?php
 	/**
 	 * Print the skip-link script.

tests/phpunit/tests/blocks/editor.php

@@ -18,6 +18,8 @@ public function set_up() {
 
 		parent::set_up();
 
+		remove_action( 'wp_print_styles', 'print_emoji_styles' );
+
 		$args = array(
 			'post_title' => 'Example',
 		);

tests/phpunit/tests/oembed/template.php

@@ -10,6 +10,8 @@ public function set_up() {
 
 		global $wp_scripts;
 		$wp_scripts = null;
+
+		remove_action( 'wp_print_styles', 'print_emoji_styles' );
 	}
 
 	public function tear_down() {

tests/phpunit/tests/theme/wpAddGlobalStylesForBlocks.php

@@ -18,6 +18,11 @@ class Tests_Theme_WpAddGlobalStylesForBlocks extends WP_Theme_UnitTestCase {
 	 */
 	private $test_blocks = array();
 
+	public function set_up() {
+		parent::set_up();
+		remove_action( 'wp_print_styles', 'print_emoji_styles' );
+	}
+
 	public function tear_down() {
 		// Unregister test blocks.
 		if ( ! empty( $this->test_blocks ) ) {