WordPress · sirreal · Dec 18, 2025 · Dec 19, 2025 · Dec 23, 2025 · Dec 23, 2025
diff --git a/src/wp-activate.php b/src/wp-activate.php
@@ -100,7 +100,7 @@ function do_activate_header() {
  */
 function wpmu_activate_stylesheet() {
 	?>
-	<style type="text/css">
+	<style>
 		.wp-activate-container { width: 90%; margin: 0 auto; }
 		.wp-activate-container form { margin-top: 2em; }
 		#submit, #key { width: 100%; font-size: 24px; box-sizing: border-box; }

diff --git a/src/wp-admin/includes/ajax-actions.php b/src/wp-admin/includes/ajax-actions.php
@@ -3946,7 +3946,7 @@ function wp_ajax_parse_media_shortcode() {
 	$styles = wpview_media_sandbox_styles();
 
 	foreach ( $styles as $style ) {
-		$head .= '<link type="text/css" rel="stylesheet" href="' . $style . '">';
+		$head .= '<link rel="stylesheet" href="' . $style . '">';
 	}
 
 	if ( ! empty( $wp_scripts ) ) {

diff --git a/src/wp-admin/includes/plugin-install.php b/src/wp-admin/includes/plugin-install.php
@@ -606,7 +606,7 @@ function install_plugin_information() {
 		$low          = empty( $api->banners['low'] ) ? $api->banners['high'] : $api->banners['low'];
 		$high         = empty( $api->banners['high'] ) ? $api->banners['low'] : $api->banners['high'];
 		?>
-		<style type="text/css">
+		<style>
 			#plugin-information-title.with-banner {
 				background-image: url( <?php echo esc_url( $low ); ?> );
 			}

diff --git a/src/wp-admin/includes/privacy-tools.php b/src/wp-admin/includes/privacy-tools.php
@@ -451,7 +451,7 @@ function wp_privacy_generate_personal_data_export_file( $request_id ) {
 	fwrite( $file, "<html>\n" );
 	fwrite( $file, "<head>\n" );
 	fwrite( $file, "<meta http-equiv='Content-Type' content='text/html; charset=UTF-8' />\n" );
-	fwrite( $file, "<style type='text/css'>" );
+	fwrite( $file, '<style>' );
 	fwrite( $file, 'body { color: black; font-family: Arial, sans-serif; font-size: 11pt; margin: 15px auto; width: 860px; }' );
 	fwrite( $file, 'table { background: #f0f0f0; border: 1px solid #ddd; margin-bottom: 20px; width: 100%; }' );
 	fwrite( $file, 'th { padding: 5px; text-align: left; width: 20%; }' );

diff --git a/src/wp-content/themes/twentyeleven/functions.php b/src/wp-content/themes/twentyeleven/functions.php
@@ -335,7 +335,7 @@ function twentyeleven_header_style() {
 
 		// If we get this far, we have custom styles. Let's do this.
 		?>
-		<style type="text/css" id="twentyeleven-header-css">
+		<style id="twentyeleven-header-css">
 		<?php
 		// Has the text been hidden?
 		if ( 'blank' === $text_color ) :

diff --git a/src/wp-content/themes/twentyeleven/header.php b/src/wp-content/themes/twentyeleven/header.php
@@ -38,7 +38,7 @@
 ?>
 	</title>
 <link rel="profile" href="https://gmpg.org/xfn/11" />
-<link rel="stylesheet" type="text/css" media="all" href="<?php echo esc_url( get_stylesheet_uri() ); ?>?ver=20251202" />
+<link rel="stylesheet" media="all" href="<?php echo esc_url( get_stylesheet_uri() ); ?>?ver=20251202" />
 <link rel="pingback" href="<?php echo esc_url( get_bloginfo( 'pingback_url' ) ); ?>">
 <?php
 	/*

diff --git a/src/wp-content/themes/twentyfifteen/inc/custom-header.php b/src/wp-content/themes/twentyfifteen/inc/custom-header.php
@@ -95,7 +95,7 @@ function twentyfifteen_header_style() {
 
 		// If we get this far, we have custom styles. Let's do this.
 		?>
-		<style type="text/css" id="twentyfifteen-header-css">
+		<style id="twentyfifteen-header-css">
 		<?php
 		// Short header for when there is no Custom Header and Header Text is hidden.
 		if ( empty( $header_image ) && ! display_header_text() ) :

diff --git a/src/wp-content/themes/twentyfourteen/inc/custom-header.php b/src/wp-content/themes/twentyfourteen/inc/custom-header.php
@@ -69,7 +69,7 @@ function twentyfourteen_header_style() {
 
 		// If we get this far, we have custom styles.
 		?>
-		<style type="text/css" id="twentyfourteen-header-css">
+		<style id="twentyfourteen-header-css">
 		<?php
 		// Has the text been hidden?
 		if ( ! display_header_text() ) :

diff --git a/src/wp-content/themes/twentynineteen/functions.php b/src/wp-content/themes/twentynineteen/functions.php
@@ -349,7 +349,7 @@ function twentynineteen_colors_css_wrap() {
 	}
 	?>
 
-	<style type="text/css" id="custom-theme-colors" <?php echo is_customize_preview() ? 'data-hue="' . absint( $primary_color ) . '"' : ''; ?>>
+	<style id="custom-theme-colors" <?php echo is_customize_preview() ? 'data-hue="' . absint( $primary_color ) . '"' : ''; ?>>
 		<?php echo twentynineteen_custom_colors_css(); ?>
 	</style>
 	<?php

diff --git a/src/wp-content/themes/twentyseventeen/functions.php b/src/wp-content/themes/twentyseventeen/functions.php
@@ -443,7 +443,7 @@ function twentyseventeen_colors_css_wrap() {
 		$customize_preview_data_hue = 'data-hue="' . $hue . '"';
 	}
 	?>
-	<style type="text/css" id="custom-theme-colors" <?php echo $customize_preview_data_hue; ?>>
+	<style id="custom-theme-colors" <?php echo $customize_preview_data_hue; ?>>
 		<?php echo twentyseventeen_custom_colors_css(); ?>
 	</style>
 	<?php

diff --git a/src/wp-content/themes/twentyseventeen/inc/custom-header.php b/src/wp-content/themes/twentyseventeen/inc/custom-header.php
@@ -77,7 +77,7 @@ function twentyseventeen_header_style() {
 
 		// If we get this far, we have custom styles. Let's do this.
 		?>
-		<style id="twentyseventeen-custom-header-styles" type="text/css">
+		<style id="twentyseventeen-custom-header-styles">
 		<?php
 		// Has the text been hidden?
 		if ( 'blank' === $header_text_color ) :

diff --git a/src/wp-content/themes/twentysixteen/inc/customizer.php b/src/wp-content/themes/twentysixteen/inc/customizer.php
@@ -90,7 +90,7 @@ function twentysixteen_header_style() {
 
 		// If the header text has been hidden.
 		?>
-		<style type="text/css" id="twentysixteen-header-css">
+		<style id="twentysixteen-header-css">
 		.site-branding {
 			margin: 0 auto 0 0;
 		}

diff --git a/src/wp-content/themes/twentyten/functions.php b/src/wp-content/themes/twentyten/functions.php
@@ -275,7 +275,7 @@ function twentyten_setup() {
 	 */
 	function twentyten_admin_header_style() {
 		?>
-	<style type="text/css" id="twentyten-admin-header-css">
+	<style id="twentyten-admin-header-css">
 	/* Shows the same border as on front end */
 	#headimg {
 	border-bottom: 1px solid #000;

diff --git a/src/wp-content/themes/twentyten/header.php b/src/wp-content/themes/twentyten/header.php
@@ -39,7 +39,7 @@
 ?>
 	</title>
 <link rel="profile" href="https://gmpg.org/xfn/11" />
-<link rel="stylesheet" type="text/css" media="all" href="<?php echo esc_url( get_stylesheet_uri() ); ?>?ver=20251202" />
+<link rel="stylesheet" media="all" href="<?php echo esc_url( get_stylesheet_uri() ); ?>?ver=20251202" />
 <link rel="pingback" href="<?php echo esc_url( get_bloginfo( 'pingback_url' ) ); ?>">
 <?php
 	/*

diff --git a/src/wp-content/themes/twentythirteen/inc/custom-header.php b/src/wp-content/themes/twentythirteen/inc/custom-header.php
@@ -96,7 +96,7 @@ function twentythirteen_header_style() {
 
 	// If we get this far, we have custom styles.
 	?>
-	<style type="text/css" id="twentythirteen-header-css">
+	<style id="twentythirteen-header-css">
 	<?php
 	if ( ! empty( $header_image ) ) :
 		?>

diff --git a/src/wp-content/themes/twentytwelve/inc/custom-header.php b/src/wp-content/themes/twentytwelve/inc/custom-header.php
@@ -77,7 +77,7 @@ function twentytwelve_header_style() {
 
 	// If we get this far, we have custom styles.
 	?>
-	<style type="text/css" id="twentytwelve-header-css">
+	<style id="twentytwelve-header-css">
 	<?php
 		// Has the text been hidden?
 	if ( ! display_header_text() ) :

diff --git a/src/wp-includes/class-wp-styles.php b/src/wp-includes/class-wp-styles.php
@@ -105,37 +105,12 @@ class WP_Styles extends WP_Dependencies {
 	 */
 	public $default_dirs;
 
-	/**
-	 * Holds a string which contains the type attribute for style tag.
-	 *
-	 * If the active theme does not declare HTML5 support for 'style',
-	 * then it initializes as `type='text/css'`.
-	 *
-	 * @since 5.3.0
-	 * @var string
-	 */
-	private $type_attr = '';
-
 	/**
 	 * Constructor.
 	 *
 	 * @since 2.6.0
 	 */
 	public function __construct() {
-		if (
-			(
-				function_exists( 'is_admin' ) &&
-				! is_admin()
-			)
-			&&
-			(
-				function_exists( 'current_theme_supports' ) &&
-				! current_theme_supports( 'html5', 'style' )
-			)
-		) {
-			$this->type_attr = " type='text/css'";
-		}
-
 		/**
 		 * Fires when the WP_Styles instance is initialized.
 		 *
@@ -184,9 +159,8 @@ public function do_item( $handle, $group = false ) {
 
 		if ( $inline_style ) {
 			$inline_style_tag = sprintf(
-				"<style id='%s-inline-css'%s>\n%s\n</style>\n",
+				"<style id='%s-inline-css'>\n%s\n</style>\n",
 				esc_attr( $handle ),
-				$this->type_attr,
 				$inline_style
 			);
 		} else {
@@ -232,12 +206,11 @@ public function do_item( $handle, $group = false ) {
 		$title = isset( $obj->extra['title'] ) ? $obj->extra['title'] : '';
 
 		$tag = sprintf(
-			"<link rel='%s' id='%s-css'%s href='%s'%s media='%s' />\n",
+			"<link rel='%s' id='%s-css'%s href='%s' media='%s' />\n",
 			$rel,
 			esc_attr( $handle ),
 			$title ? sprintf( " title='%s'", esc_attr( $title ) ) : '',
 			$href,
-			$this->type_attr,
 			esc_attr( $media )
 		);
 
@@ -264,12 +237,11 @@ public function do_item( $handle, $group = false ) {
 			}
 
 			$rtl_tag = sprintf(
-				"<link rel='%s' id='%s-rtl-css'%s href='%s'%s media='%s' />\n",
+				"<link rel='%s' id='%s-rtl-css'%s href='%s' media='%s' />\n",
 				$rel,
 				esc_attr( $handle ),
 				$title ? sprintf( " title='%s'", esc_attr( $title ) ) : '',
 				$rtl_href,
-				$this->type_attr,
 				esc_attr( $media )
 			);
 
@@ -365,9 +337,8 @@ public function print_inline_style( $handle, $display = true ) {
 		}
 
 		printf(
-			"<style id='%s-inline-css'%s>\n%s\n</style>\n",
+			"<style id='%s-inline-css'>\n%s\n</style>\n",
 			esc_attr( $handle ),
-			$this->type_attr,
 			$output
 		);
 

diff --git a/src/wp-includes/deprecated.php b/src/wp-includes/deprecated.php
@@ -5897,10 +5897,9 @@ function _wp_theme_json_webfonts_handler() {
 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';
+	$suffix = SCRIPT_DEBUG ? '' : '.min';
 	?>
-	<style<?php echo $type_attr; ?>>
+	<style>
 		<?php echo file_get_contents( ABSPATH . WPINC . "/css/wp-embed-template$suffix.css" ); ?>
 	</style>
 	<?php
@@ -5922,9 +5921,8 @@ function print_emoji_styles() {
 
 	$printed = true;
 
-	$type_attr = current_theme_supports( 'html5', 'style' ) ? '' : ' type="text/css"';
 	?>
-	<style<?php echo $type_attr; ?>>
+	<style>
 	img.wp-smiley,
 	img.emoji {
 		display: inline !important;
@@ -5949,9 +5947,8 @@ function print_emoji_styles() {
  */
 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>
+	<style media="print">#wpadminbar { display:none; }</style>
 	<?php
 }
 
@@ -5963,9 +5960,8 @@ function wp_admin_bar_header() {
  */
 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">
+	<style media="screen">
 	html { margin-top: 32px !important; }
 	@media screen and ( max-width: 782px ) {
 	  html { margin-top: 46px !important; }

diff --git a/src/wp-includes/fonts/class-wp-font-face.php b/src/wp-includes/fonts/class-wp-font-face.php
@@ -61,32 +61,6 @@ class WP_Font_Face {
 	 */
 	private $valid_font_display = array( 'auto', 'block', 'fallback', 'swap', 'optional' );
 
-	/**
-	 * Array of font-face style tag's attribute(s)
-	 * where the key is the attribute name and the
-	 * value is its value.
-	 *
-	 * @since 6.4.0
-	 *
-	 * @var string[]
-	 */
-	private $style_tag_attrs = array();
-
-	/**
-	 * Creates and initializes an instance of WP_Font_Face.
-	 *
-	 * @since 6.4.0
-	 */
-	public function __construct() {
-		if (
-			function_exists( 'is_admin' ) && ! is_admin()
-			&&
-			function_exists( 'current_theme_supports' ) && ! current_theme_supports( 'html5', 'style' )
-		) {
-			$this->style_tag_attrs = array( 'type' => 'text/css' );
-		}
-	}
-
 	/**
 	 * Generates and prints the `@font-face` styles for the given fonts.
 	 *
@@ -227,24 +201,7 @@ private function validate_font_face_declarations( array $font_face ) {
 	 * @return string The style element.
 	 */
 	private function get_style_element() {
-		$attributes = $this->generate_style_element_attributes();
-
-		return "<style class='wp-fonts-local'{$attributes}>\n%s\n</style>\n";
-	}
-
-	/**
-	 * Gets the defined <style> element's attributes.
-	 *
-	 * @since 6.4.0
-	 *
-	 * @return string A string of attribute=value when defined, else, empty string.
-	 */
-	private function generate_style_element_attributes() {
-		$attributes = '';
-		foreach ( $this->style_tag_attrs as $name => $value ) {
-			$attributes .= " {$name}='{$value}'";
-		}
-		return $attributes;
+		return "<style class='wp-fonts-local'>\n%s\n</style>\n";
 	}
 
 	/**

diff --git a/src/wp-includes/functions.php b/src/wp-includes/functions.php
@@ -3921,7 +3921,7 @@ function _default_wp_die_handler( $message, $title = '', $args = array() ) {
 		}
 		?>
 	<title><?php echo $title; ?></title>
-	<style type="text/css">
+	<style>
 		html {
 			background: #f1f1f1;
 		}

diff --git a/src/wp-includes/general-template.php b/src/wp-includes/general-template.php
@@ -5061,7 +5061,7 @@ function wp_admin_css( $file = 'wp-admin', $force_echo = false ) {
 	}
 
 	$stylesheet_link = sprintf(
-		"<link rel='stylesheet' href='%s' type='text/css' />\n",
+		"<link rel='stylesheet' href='%s' />\n",
 		esc_url( wp_admin_css_uri( $file ) )
 	);
 
@@ -5080,7 +5080,7 @@ function wp_admin_css( $file = 'wp-admin', $force_echo = false ) {
 
 	if ( function_exists( 'is_rtl' ) && is_rtl() ) {
 		$rtl_stylesheet_link = sprintf(
-			"<link rel='stylesheet' href='%s' type='text/css' />\n",
+			"<link rel='stylesheet' href='%s' />\n",
 			esc_url( wp_admin_css_uri( "$file-rtl" ) )
 		);
 

diff --git a/src/wp-includes/media.php b/src/wp-includes/media.php
@@ -2871,10 +2871,8 @@ function gallery_shortcode( $attr ) {
 	 *                    Otherwise, defaults to true.
 	 */
 	if ( apply_filters( 'use_default_gallery_style', ! $html5 ) ) {
-		$type_attr = current_theme_supports( 'html5', 'style' ) ? '' : ' type="text/css"';
-
 		$gallery_style = "
-		<style{$type_attr}>
+		<style>
 			#{$selector} {
 				margin: auto;
 			}

diff --git a/src/wp-includes/ms-deprecated.php b/src/wp-includes/ms-deprecated.php
@@ -94,7 +94,7 @@ function graceful_fail( $message ) {
 <html><head>
 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
 <title>Error!</title>
-<style type="text/css">
+<style>
 img {
 	border: 0;
 }
-Original file line number
+Diff line change
@@ Expand Up @@
     		}
     		?>
     	<title><?php echo $title; ?></title>
-    	<style type="text/css">
+    	<style>
     		html {
     			background: #f1f1f1;
     		}
@@ Expand Down @@