text-target.html - mozsearch

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This WPT test may be referenced by the following Test IDs:
- /intersection-observer/text-target.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;

.spacer {

  height: calc(100vh + 100px);

</style>

<div class="spacer"></div>

<br id="target">

<div class="spacer"></div>

<script>

var vw = document.documentElement.clientWidth;

var vh = document.documentElement.clientHeight;

var entries = [];

var target;

var tw, th;

runTestCycle(function() {

  target = document.getElementById("target");

  let target_rect = target.getBoundingClientRect();

  tw = target_rect.width;

  th = target_rect.height;

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

  var observer = new IntersectionObserver(function(changes) {

    entries = entries.concat(changes)

});

  observer.observe(target);

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

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

  runTestCycle(step0, "First rAF.");

}, "IntersectionObserver observing a br element.");

function step0() {

  document.scrollingElement.scrollTop = 300;

  runTestCycle(step1, "document.scrollingElement.scrollTop = 300");

  // The numbers in brackets are target client rect; intersection rect;

  // and root bounds.

  checkLastEntry(entries, 0, [8, 8 + tw, vh + 108, vh + 108 + th, 0, 0, 0, 0, 0, vw, 0, vh, false]);

function step1() {

  document.scrollingElement.scrollTop = 100;

  runTestCycle(step2, "document.scrollingElement.scrollTop = 100");

  checkLastEntry(entries, 1, [8, 8 + tw, vh - 192, vh - 192 + th, 8, 8 + tw, vh - 192, vh - 192 + th, 0, vw, 0, vh, true]);

function step2() {

  document.scrollingElement.scrollTop = 0;

  checkLastEntry(entries, 2, [8, 8 + tw, vh + 8, vh + 8 + th, 0, 0, 0, 0, 0, vw, 0, vh, false]);

</script>