simple-effects.html

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This test has a WPT meta file that expects 4 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /intersection-observer/v2/simple-effects.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>

<style>

body, html {

  margin: 0;

pre, #log {

  position: absolute;

  top: 0;

  left: 200px;

#target {

  width: 100px;

  height: 100px;

  background-color: green;

#effects {

  opacity: 1;

  filter: none;

</style>

<div id="effects">

  <div id="target"></div>

</div>

<script>

var delay = 100;

var entries = [];

var target;

var effects;

runTestCycle(function() {

  target = document.getElementById("target");

  effects = document.getElementById("effects");

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

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

  var observer = new IntersectionObserver(function(changes) {

    entries = entries.concat(changes)

  }, {trackVisibility: true, delay: delay});

  observer.observe(target);

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

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

  runTestCycle(step0, "First rAF.", delay);

}, "IntersectionObserverV2 in a single document using the implicit root, with a non-zero opacity ancestor.", delay);

function step0() {

  effects.style.opacity = "0.99";

  runTestCycle(step1, "effects.style.opacity = 0.99", delay);

  checkLastEntry(entries, 0, [0, 100, 0, 100, 0, 100, 0, 100, 0, 800, 0, 600, true, true]);

function step1() {

  effects.style.opacity = "1";

  runTestCycle(step2, "effects.style.opacity = 1", delay);

  checkLastEntry(entries, 1, [0, 100, 0, 100, 0, 100, 0, 100, 0, 800, 0, 600, true, false]);

function step2() {

  effects.style.filter = "grayscale(50%)";

  runTestCycle(step3, "effects.style.filter = grayscale(50%)", delay);

  checkLastEntry(entries, 2, [0, 100, 0, 100, 0, 100, 0, 100, 0, 800, 0, 600, true, true]);

function step3() {

  checkLastEntry(entries, 3, [0, 100, 0, 100, 0, 100, 0, 100, 0, 800, 0, 600, true, false]);

</script>