* Only set button and menu if container is not null.
* Break up the "return early" conditional into multiple parts.
* Shorten the name of the toggled class from `toggled-on` to `toggled`.
* Restore the "Hide menu toggle button if menu is empty." documentation.
* Remove the `nav-menu` class. The previous code would replace any custom custom classes applied via `wp_nav_menu()` or template file.
* Replace the `nav-menu` selector is style.css with selectors that will target both a custom nav menu and a page menu. These changes could use critical feedback. Do you know of an edge case where they might not work as expected?
Michael Fields
obenland
Konstantin Kovshenin