function detailsToggle(matches) {
if (matches) {
$details.attr('open', true);
$summaries.attr('aria-expanded', true);
$summaries.on('click.details-open', false);
function detailsToggle(matches) {
if (matches) {
$details.attr('open', true);
$summaries.attr('aria-expanded', true);
$summaries.on('click.details-open', false);