WP_Customize_Custom_CSS_Setting::validate( string $value )

Validate a received value for being valid CSS.

Description

Checks for imbalanced braces, brackets, and comments.
Notifications are rendered when the customizer state is saved.

Parameters

$value

(Required) CSS to validate.

Return

(true|WP_Error) True if the input was validated, otherwise WP_Error.

Source

File: wp-includes/customize/class-wp-customize-custom-css-setting.php 

	public function validate( $css ) {
		$validity = new WP_Error();

		if ( preg_match( '#</?\w+#', $css ) ) {
			$validity->add( 'illegal_markup', __( 'Markup is not allowed in CSS.' ) );
		}

		if ( empty( $validity->errors ) ) {
			$validity = parent::validate( $css );
		}
		return $validity;
	}

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Changelog

Changelog
Version Description
5.9.0 Renamed $css to $value for PHP 8 named parameter support.
4.9.0 Checking for balanced characters has been moved client-side via linting in code editor.
4.7.0 Introduced.