scroll-margin-iframe.html

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This WPT test may be referenced by the following Test IDs:
- /intersection-observer/scroll-margin-iframe.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>

<iframe

  id="target-iframe"

  src="resources/iframe-no-root-subframe.html"

  width="300"

  height="200"

></iframe>

<script>

var iframe = document.getElementById("target-iframe");

var target;

var entries = [];

iframe.onload = function() {

  runTestCycle(function() {

    assert_true(!!iframe, "iframe exists");

    target = iframe.contentDocument.getElementById("target");

    assert_true(!!target, "Target element exists.");

    var observer = new IntersectionObserver(function(changes) {

      entries = entries.concat(changes)

    }, {

      scrollMargin: "18px"

});

    observer.observe(target);

    entries = entries.concat(observer.takeRecords());

    assert_equals(entries.length, 0, "No initial notifications.");

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

  }, "Observer with the implicit root; target in a same-origin iframe.");

};

function testIntersection() {

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

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

  assert_approx_equals(entries[0].intersectionRatio, 0.1, 0.001, "intersectionRatio");

</script>