Excess spaces. Also, it'd be nice to pull these two actions into a function and pass it instead to avoid repeating the code.

```javascript
function collapsePageNav() {
    $navList.slideUp('fast').attr('aria-hidden', 'true').removeAttr('aria-expanded');
    $("#page-nav .toggle").removeClass("open");
}

$document.on('click', 'body.thin-mode .toggle.open', collapsePageNav);
```