How to add event listeners in Internet Explorer 9+

Attach Event Listener for IE > v9

// From https://stackoverflow.com/questions/20180046/attachevent-doesnt-work-in-ie-8-0

// You can run some feature-checking code to check if the supported features exist:

if (window.addEventListener) {
    // Check for addEventListener first, since IE9/10 have both,
    // but you should use the standard over the deprecated IE-specific one
    window.addEventListener('click', myFunc);
} else if (window.attachEvent) {
    window.attachEvent('onclick', myFunc);
}