File: image_loading_lazy.html

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<!doctype html>
<img id="image" src="/blank.jpg" loading="lazy" />

<script>
  let image_loaded = false;
  let promise_with_resolvers = Promise.withResolvers();
  let image = document.getElementById("image");

  image.addEventListener("load", (_) => {
    image_loaded = true;
    promise_with_resolvers.resolve();
  });

  function runLoop() {
    return new Promise((resolve) => {
      setTimeout(resolve, 100);
    });
  }
</script>