wp_add_editor_classic_theme_styles( array $editor_settings ): array

Loads classic theme styles on classic themes in the editor.


This is needed for backwards compatibility for button blocks specifically.

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$editor_settings array Required
The array of editor settings.

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array A filtered array of editor settings.

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File: wp-includes/script-loader.php. View all references

function wp_add_editor_classic_theme_styles( $editor_settings ) {
	if ( wp_theme_has_theme_json() ) {
		return $editor_settings;

	$suffix               = wp_scripts_get_suffix();
	$classic_theme_styles = ABSPATH . WPINC . "/css/classic-themes$suffix.css";

	 * This follows the pattern of get_block_editor_theme_styles,
	 * but we can't use get_block_editor_theme_styles directly as it
	 * only handles external files or theme files.
	$classic_theme_styles_settings = array(
		'css'            => file_get_contents( $classic_theme_styles ),
		'__unstableType' => 'core',
		'isGlobalStyles' => false,

	// Add these settings to the start of the array so that themes can override them.
	array_unshift( $editor_settings['styles'], $classic_theme_styles_settings );

	return $editor_settings;

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Version Description
6.1.0 Introduced.

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