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// ==========================================================================
// tab-focus.js
// Detect keyboard tabbing
// ==========================================================================
(function() {
var className = 'tab-focus';
// Remove class on blur
document.addEventListener('focusout', function(event) {
event.target.classList.remove(className);
});
// Add classname to tabbed elements
document.addEventListener('keydown', function(event) {
if (event.keyCode !== 9) {
return;
}
// Delay the adding of classname until the focus has changed
// This event fires before the focusin event
window.setTimeout(function() {
document.activeElement.classList.add(className);
}, 0);
});
})();
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