Do not require consumers to pass the <style> tag

lib/block-supports/elements.php

@@ -43,7 +43,7 @@ function gutenberg_render_elements_support( $block_content, $block ) {
 	}
 	$link_color_declaration = esc_html( safecss_filter_attr( "color: $link_color" ) );
 
-	$style = "<style>.$class_name a{" . $link_color_declaration . ";}</style>\n";
+	$style = ".$class_name a{" . $link_color_declaration . ';}';
 
 	// Like the layout hook this assumes the hook only applies to blocks with a single wrapper.
 	// Retrieve the opening tag of the first HTML element.

lib/block-supports/layout.php

@@ -156,7 +156,7 @@ function gutenberg_render_layout_support_flag( $block_content, $block ) {
 	// Regex for CSS value borrowed from `safecss_filter_attr`, and used here
 	// because we only want to match against the value, not the CSS attribute.
 	$gap_value = preg_match( '%[\\\(&=}]|/\*%', $gap_value ) ? null : $gap_value;
-	$style     = '<style>' . gutenberg_get_layout_style( ".wp-container-$id", $used_layout, $has_block_gap_support, $gap_value ) . '</style>';
+	$style     = gutenberg_get_layout_style( ".wp-container-$id", $used_layout, $has_block_gap_support, $gap_value );
 	// This assumes the hook only applies to blocks with a single wrapper.
 	// I think this is a reasonable limitation for that particular hook.
 	$content = preg_replace(

lib/blocks.php

@@ -610,7 +610,7 @@ function gutenberg_enqueue_block_support( $style ) {
 	add_action(
 		$action_hook_name,
 		function () use ( $style ) {
-			echo $style;
+			echo "<style>$style</style>\n";
 		}
 	);
 }