Understanding event registration

So let's talk a little about events before we get too far.…JavaScript normally runs code sequentially, which means in the order that the…browser reads it from your file, but we can write JavaScript code that will run…only when something happens in the browser.…That's because browsers can trigger events, when things happen to elements on your page.…JavaScript events can happen at any time.…For example, when the page loads in a browser, when the user moves the mouse…over a link, when a video has finished loading, or when a form is submitted.…

All those things are events, so if you want to take care of a task…when something happens.…You have to capture that event, and that's done through a process called…event registration.…This means telling the browser that you want to do something when an event takes…place, and there's several ways of doing that.…Some are more compatible with older browsers than others.…So the first way of doing this is by using tag attributes, and this works pretty simply.…