function computeStyle(elt)
{
    return document.defaultView.getComputedStyle(elt, null)
}

function addListener(elt, eventName, eventHandler, isCapture)
{
    elt.addEventListener(eventName, eventHandler, isCapture);
}

function removeListener(elt, eventName, eventHandler, isCapture)
{
    elt.removeEventListener(eventName, eventHandler, isCapture);
}

function getEventTarget(event)
{
    return event.target;
}

function preventDefault(event)
{
    event.preventDefault();
}

function stopPropagation(event)
{
    event.stopPropagation();
}

function windowScrollX()
{
    return window.scrollX;
}

function windowScrollY()
{
    return window.scrollY;
}

function windowInnerHeight()
{
    return window.innerHeight;
}

function windowInnerWidth()
{
    return window.innerWidth;
}