scroll-margin-nested-3.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /intersection-observer/scroll-margin-nested-3.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta name="viewport" content="width=device-width,initial-scale=1">

<link rel="help" href="https://www.w3.org/TR/intersection-observer/#dom-intersectionobserver-scrollmargin">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="./resources/intersection-observer-test-utils.js"></script>

<style>

#scroller { width: 100px; height: 100px; overflow: hidden; background-color: gray; }

#scroller2 { width: 130px; height: 130px; overflow: hidden; }

#scroller3 { width: 160px; height: 160px; overflow: hidden; }

#spacer { width: 50px; height: 100px; }

#target { width: 50px; height: 50px; background-color: green; }

</style>

<div id=scroller3>

  <div id=scroller2>

    <div id=scroller>

      <div id=spacer></div>

      <div id=target></div>

    </div>

  </div>

</div>

<script>

let entries = [];

window.onload = function() {

  runTestCycle(testIntersection, "Test scroll margin intersection");

  const observer = new IntersectionObserver(

    es => entries = entries.concat(es),

      scrollMargin: "10px"

);

  observer.observe(target);

};

function testIntersection() {

  assert_equals(entries.length, 1, "IntersectionObserverEntryCount");

  assert_true(entries[0].isIntersecting, "isIntersecting");

  assert_approx_equals(entries[0].intersectionRatio, 0.2, 0.001, "intersectionRatio");

</script>