How to get href of anchor when the event.target is HTMLImageElement?

I want to get the href of an anchor element when it is clicked. I am using the following javascript code:

document.addEventListener('click', function (event)
{
    event = event || window.event;
    var el = event.target || event.srcElement;

    if (el instanceof HTMLAnchorElement)
    {
        console.log(el.getAttribute('href'));
    }
}, true);

This works perfectly for an embedded anchor such as this:

<div><p><a href='link'></a></p><div>

But it doesn't work when I am working with an anchor and an image:

<div><a href='link'><img></a></div>

The event.target is returning the image instead of the anchor. The javascript code can be amended with the following if case to get around this:

document.addEventListener('click', function (event)
{
    event = event || window.event;
    var el = event.target || event.srcElement;

    if (el instanceof HTMLImageElement)
    {
        // Using parentNode to get the image element parent - the anchor element.
        console.log(el.parentNode.getAttribute('href'));
    }
    else if (el instanceof HTMLAnchorElement)
    {
        console.log(el.getAttribute('href'));
    }
}, true);

But this doesn't seem very elegant and I'm wondering if there is a better way.

!IMPORTANT! NOTE: Keep in mind, I have no access to an ID or class, or any other traditional identifier for that matter. All I know is that there will be an anchor clicked and I need to get its href.