A Deep Dive into Native Lazy-Loading for Images and Frames
CSS - Tricks
MAY 15, 2019
Chrome has already merged the code for native lazy-loading and is expected to ship it in Chrome 75, which is slated to release June 4, 2019. You might have to perform a hard reload ( CTRL + Shift + R ) to re-trigger range requests. The pre-native approach. If this column is filled, the browser made a successful range request.
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