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<img src="image.jpg" alt="..." loading="lazy" />
<iframe src="video-player.html" title="..." loading="lazy"></iframe>
Loading attribute The loading attribute on an <img> element (or the loading attribute on an <iframe>)
can be used to instruct the browser to defer loading of images/iframes that are off-screen
until the user scrolls near them.
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<img src="image.png" loading="lazy" alt="…" style="height:200px; width:200px;">