Automattic / jetpack

	// $args['autoplay'] is parsed from the embedded url.

	// $autoplay is parsed from shortcode arguments.

	// in_array( 'autoplay', $atts ) catches the argument passed without a value.

	if ( ! empty( $args['autoplay'] ) || ! empty( $autoplay ) || in_array( 'autoplay', $atts ) ) {

		$url = add_query_arg( 'autoplay', 1, $url );

	}

	if ( ! empty( $args['loop'] ) || ! empty( $loop ) || in_array( 'loop', $atts ) ) {

		$url = add_query_arg( 'loop', 1, $url );

		$url = add_query_arg( 'autoplay', 1, $url );

	}

	if ( ! empty( $args['loop'] ) || ! empty( $loop ) || in_array( 'loop', $atts ) ) {

		$url = add_query_arg( 'loop', 1, $url );

	}

	$html = sprintf( '<div class="embed-vimeo" style="text-align:center;"><iframe src="%1$s" width="%2$u" height="%3$u" frameborder="0" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe></div>', esc_url( $url ), $width, $height );