containing-block.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/containing-block.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>

pre, #log {

  position: absolute;

  top: 0;

  left: 200px;

#root {

  width: 170px;

  height: 200px;

  overflow-y: scroll;

#target {

  width: 100px;

  height: 100px;

  background-color: green;

  position: absolute;

</style>

<div id="root" style="position: absolute">

  <div id="target" style="left: 50px; top: 250px"></div>

</div>

<script>

var entries = [];

var root, target;

runTestCycle(function() {

  root = document.getElementById("root");

  assert_true(!!root, "root element exists.");

  target = document.getElementById("target");

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

  var observer = new IntersectionObserver(function(changes) {

    entries = entries.concat(changes);

  }, { root: root });

  observer.observe(target);

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

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

  target.style.top = "10px";

  runTestCycle(test1, "In containing block and intersecting.");

}, "IntersectionObserver should only report intersections if root is a containing block ancestor of target.");

function test1() {

  runTestCycle(test2, "In containing block and not intersecting.");

  var rootBounds = contentBounds(root);

  checkLastEntry(entries, 0, [58, 158, 18, 118, 58, 158, 18, 118].concat(rootBounds));

  target.style.top = "250px";

function test2() {

  runTestCycle(test3, "Not in containing block and intersecting.");

  var rootBounds = contentBounds(root);

  checkLastEntry(entries, 1, [58, 158, 258, 358, 0, 0, 0, 0].concat(rootBounds));

  root.style.position = "static";

  target.style.top = "10px";

function test3() {

  runTestCycle(test4, "Not in containing block and not intersecting.");

  checkLastEntry(entries, 1);

  target.style.top = "250px";

function test4() {

  checkLastEntry(entries, 1);

  target.style.top = "0";

</script>