File: test_reframe_for_lazy_load_image.html

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<!doctype html>
<meta charset=utf-8>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
<div id='log'></div>
<script>
'use strict';
SimpleTest.waitForExplicitFinish();
SpecialPowers.pushPrefEnv(
  // Open a new document with enabling lazy load since we need to create an
  // image element with loading="lazy" and alt="something" in the first place.
  // That's because if the element has `alt` but doesn't have `lazy` we will
  // generate inline frames due to the `alt`.  Also if we do add the `lazy` and
  // the `alt` dynamically, it ends up generating reconstruct change hint for
  // the `alt` change.
  {
    set: [
      ["dom.image-lazy-loading.root-margin.top", 0],
      ["dom.image-lazy-loading.root-margin.bottom", 0],
      ["dom.image-lazy-loading.root-margin.left", 0],
      ["dom.image-lazy-loading.root-margin.right", 0],
    ]
  },
  () => { window.open('file_reframe_for_lazy_load_image.html'); }
);
</script>
</html>