WP_Style_Engine_CSS_Declarations::add_declaration( string $property, string $value ): WP_Style_Engine_CSS_Declarations

54	public function add_declaration( $property, $value ) {55		// Sanitizes the property.56		$property = $this->sanitize_property( $property );57		// Bails early if the property is empty.58		if ( empty( $property ) ) {59			return $this;60		}61 62		// Bail early if value is not a string. Prevents fatal errors from malformed block markup.63		if ( ! is_string( $value ) ) {64			return $this;65		}66 67		// Trims the value. If empty, bail early.68		$value = trim( $value );69		if ( '' === $value ) {70			return $this;71		}72 73		// Adds the declaration property/value pair.74		$this->declarations[ $property ] = $value;75 76		return $this;77	}