This page demonstrates Lazy loading images. At the bottom of the page there's an image that is not loaded until you scroll down to it. You can see this in the Google Chrome developer tools waterfall chart: open the developer tools, switch to the network panel, position the window so that you can see both it and the browser, and then scroll to the bottom of the page. When you get to the image the browser will make a new request for the image and display it.
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Scroll down to see the image.