Astra_Font_Families::get_system_fonts()

		public static function get_system_fonts() {
			if ( empty( self::$system_fonts ) ) {
				self::$system_fonts = array(
					'Helvetica' => array(
						'fallback' => 'Verdana, Arial, sans-serif',
						'weights'  => array(
							'300',
							'400',
							'700',
						),
					),
					'Verdana'   => array(
						'fallback' => 'Helvetica, Arial, sans-serif',
						'weights'  => array(
							'300',
							'400',
							'700',
						),
					),
					'Arial'     => array(
						'fallback' => 'Helvetica, Verdana, sans-serif',
						'weights'  => array(
							'300',
							'400',
							'700',
						),
					),
					'Times'     => array(
						'fallback' => 'Georgia, serif',
						'weights'  => array(
							'300',
							'400',
							'700',
						),
					),
					'Georgia'   => array(
						'fallback' => 'Times, serif',
						'weights'  => array(
							'300',
							'400',
							'700',
						),
					),
					'Courier'   => array(
						'fallback' => 'monospace',
						'weights'  => array(
							'300',
							'400',
							'700',
						),
					),
				);
			}

			return apply_filters( 'astra_system_fonts', self::$system_fonts );
		}