fixed-position-iframe-scroll.html

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This WPT test may be referenced by the following Test IDs:
- /intersection-observer/fixed-position-iframe-scroll.html - WPT Dashboard Interop Dashboard

<!doctype html>

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

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

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

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

<div style="position: fixed; top: 0; left: 0">

  <iframe id="iframe" style="width: 300px; height: 300px; border: none"

          srcdoc="<style>body {margin: 0}</style>

                  <div id='target' style='width: 100px; height: 100px'></div>">

  </iframe>

</div>

<div id="log" style="height: 2000px"></div>

<script>

var entries = [];

iframe.onload = () => {

  runTestCycle(function() {

    var observer = new IntersectionObserver(function(changes) {

      entries = entries.concat(changes)

});

    observer.observe(iframe.contentDocument.getElementById('target'));

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

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

    runTestCycle(step0, 'First rAF.');

  }, 'Fixed-position intersection observer on scroll');

};

function step0() {

  window.scrollTo(0, 1000);

  runTestCycle(step1, 'scrollTo(0, 1000)');

  checkLastEntry(entries, 0,

                 [0, 100, 0, 100, 0, 100, 0, 100, 0,

                  document.documentElement.clientWidth, 0, document.documentElement.clientHeight,

                  true]);

function step1() {

  window.scrollTo(0, 0);

  checkLastEntry(entries, 0,

                 [0, 100, 0, 100, 0, 100, 0, 100, 0,

                  document.documentElement.clientWidth, 0, document.documentElement.clientHeight,

                  true]);

</script>