1 files changed, 38 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/semantics/embedded-content/the-img-element/image-loading-lazy-move-document.html b/testing/web-platform/tests/html/semantics/embedded-content/the-img-element/image-loading-lazy-move-document.html
new file mode 100644
index 0000000000..ff7e83105c
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/embedded-content/the-img-element/image-loading-lazy-move-document.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<head>
+<title>Moving loading='lazy' image into another top level document</title>
+<link rel="help" href="https://github.com/scott-little/lazyload">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+</head>
+
+<div style="height:1000vh;"></div>
+<img loading="lazy"
+     src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAIAAAAC64paAAAAG0lEQVR42mP8z0A%2BYKJA76jmUc2jmkc1U0EzACKcASfOgGoMAAAAAElFTkSuQmCC">
+<script>
+promise_test(async t => {
+  let image_loaded = false;
+  const img = document.querySelector("img");
+  img.addEventListener("load", () => { image_loaded = true; });
+
+  await new Promise(resolve => window.addEventListener("load", resolve));
+
+  assert_false(image_loaded,
+               "lazy-load image shouldn't be loaded yet");
+
+  const anotherWin = window.open("resources/newwindow.html");
+
+  await new Promise(resolve => anotherWin.addEventListener("load", resolve));
+
+  anotherWin.document.body.appendChild(img);
+
+  assert_false(image_loaded,
+               "lazy-load image shouldn't be loaded yet");
+
+  img.scrollIntoView();
+
+  await new Promise(resolve => img.addEventListener("load", resolve));
+  assert_true(img.complete,
+              "Now the lazy-load image should be loaded");
+});
+</script>