Preview Website
Open browser Developer Tools (Press F12) > Application > Images
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Note, you should only see tiger.jpg listed
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You can also use with Dev Tools > Network
Scroll down slowly:
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elephant.jpg should appear in the Images list
Continue scrolling:
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bear.jpg should appear in the Images list
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camel.jpg should appear in the Images list
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As you scroll to the foot of this page, the two images are full resolution
images that are on the lazy.htm page, scaled down on the page
