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_s/js/navigation.js

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JavaScript
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/**
* navigation.js
*
* Handles toggling the navigation menu for small screens.
*/
( function() {
var container, button, menu;
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container = document.getElementById( 'site-navigation' );
if ( ! container )
return;
button = container.getElementsByTagName( 'button' )[0];
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if ( 'undefined' === typeof button )
return;
menu = container.getElementsByTagName( 'ul' )[0];
// Hide menu toggle button if menu is empty and return early.
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if ( 'undefined' === typeof menu ) {
button.style.display = 'none';
return;
}
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if ( -1 === menu.className.indexOf( 'nav-menu' ) )
menu.className += ' nav-menu';
button.onclick = function() {
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if ( -1 !== container.className.indexOf( 'toggled' ) )
container.className = container.className.replace( ' toggled', '' );
else
container.className += ' toggled';
};
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} )();