File: src-then-lazy-load.html

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<!doctype html>
<title>Image shouldn't load synchronously out of the document.</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<script>
async function run_test(prop, image, repetitions, t) {
  for (let i = 0; i < repetitions; ++i) {
    let img = document.createElement("img")
    img[prop] = `${image}?src-then-lazy-load-` + Math.random();
    img.loading = "lazy";
    img.style.display = "none";
    img.addEventListener("error", t.unreached_func("error: should never try to load"));
    img.addEventListener("load", t.unreached_func("load: should never try to load"));
    document.body.appendChild(img);
    await new Promise(r => t.step_timeout(r, 500));
  }
}

for (let prop of ["src", "srcset"]) {
  for (let path of ["/images/green.png", "/images/not-found"]) {
    for (let repetitions of [1, 2]) {
      promise_test(t => run_test(prop, path, repetitions, t), `${prop} = ${path} ${repetitions} time(s)`);
    }
  }
}
</script>