If you need a keyboard shortcut to open the preview in wordpress. Just add the function to your function.php
function add_custom_keyboard_shortcut_jquery() {
?>
<script type="text/javascript">
jQuery(document).keydown(function(event) {
if ((event.metaKey || event.ctrlKey) && event.which === 89) {
event.preventDefault();
jQuery('#post-preview').click();
}
});
</script>
<?php
}
add_action( 'admin_head-post.php', 'add_custom_keyboard_shortcut_jquery' );
add_action( 'admin_head-post-new.php', 'add_custom_keyboard_shortcut_jquery' );
With CMD+y on Mac or STRG+y on Windows will open the preview window quick.