bounding-box.html - mozsearch

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This WPT test may be referenced by the following Test IDs:
- /intersection-observer/bounding-box.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 {

  overflow: visible;

  height: 200px;

  width: 160px;

  border: 8px solid black;

#target {

  margin: 10px;

  width: 100px;

  height: 100px;

  padding: 10px;

  background-color: green;

</style>

<div id="root">

  <div id="target" style="transform: translateY(300px)"></div>

</div>

<script>

var entries = [];

var target;

runTestCycle(function() {

  target = document.getElementById("target");

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

  var root = document.getElementById("root");

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

  runTestCycle(step0, "First rAF.");

}, "Test that the target's border bounding box is used to calculate intersection.");

function step0() {

  var targetBounds = clientBounds(target);

  target.style.transform = "translateY(195px)";

  runTestCycle(step1, "target.style.transform = 'translateY(195px)'");

  checkLastEntry(entries, 0, targetBounds.concat(0, 0, 0, 0, 8, 184, 8, 224, false));

function step1() {

  var targetBounds = clientBounds(target);

  target.style.transform = "translateY(300px)";

  runTestCycle(step2, "target.style.transform = 'translateY(300px)'");

  checkLastEntry(entries, 1, targetBounds.concat(26, 146, 221, 224, 8, 184, 8, 224, true));

function step2() {

  var targetBounds = clientBounds(target);

  target.style.transform = "";

  target.style.zoom = "2";

  runTestCycle(step3, "target.style.zoom = 2");

  checkLastEntry(entries, 2, targetBounds.concat(0, 0, 0, 0, 8, 184, 8, 224, false));

function step3() {

  var targetBounds = clientBounds(target);

  var intersectionWidth = (

      176  // root width including border

      -8   // root left border

      -20  // target left margin * target zoom

  var intersectionHeight = (216 - 8 - 20);

  var intersectionRect = [targetBounds[0], targetBounds[0] + intersectionWidth,

                          targetBounds[2], targetBounds[2] + intersectionHeight];

  checkLastEntry(entries, 3, targetBounds.concat(intersectionRect).concat(8, 184, 8, 224, true));

</script>