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chromium/third_party/blink/web_tests/external/wpt/html/semantics/embedded-content/the-img-element/natural-size-orientation.html 

<!DOCTYPE html>
<meta charset=utf-8>
<title>naturalWidth and naturalHeight on HTMLImageElement reflect orientation metadata</title>
<link rel="author" title="Cameron McCormack" href="mailto:[email protected]">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
.ignore-orientation { image-orientation: none; }
</style>
<body>
<script>
async_test(function(t) {
  let img = document.createElement("img");
  img.src = "/images/green-100x50.png";
  img.onload = t.step_func_done(function() {
    assert_equals(img.naturalWidth, 100);
    assert_equals(img.naturalHeight, 50);
    img.remove();
  });
  document.body.append(img);
}, "naturalWidth and naturalHeight return correct values for an image without orientation metadata");

async_test(function(t) {
  let img = document.createElement("img");
  img.src = "/images/arrow-oriented-upright.jpg";
  img.onload = t.step_func_done(function() {
    assert_equals(img.naturalWidth, 144);
    assert_equals(img.naturalHeight, 240);
    img.remove();
  });
  document.body.append(img);
}, "naturalWidth and naturalHeight return re-oriented values for an image with orientation metadata");

async_test(function(t) {
  let img = document.createElement("img");
  img.src = "/images/arrow-oriented-upright.jpg";
  img.className = "ignore-orientation";
  img.onload = t.step_func_done(function() {
    assert_equals(img.naturalWidth, 144);
    assert_equals(img.naturalHeight, 240);
    img.remove();
  });
  document.body.append(img);
}, "naturalWidth and naturalHeight return re-oriented values for an image with orientation metadata even with image-orientation:none");
</script>