document-scrolling-element-root.html

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This WPT test may be referenced by the following Test IDs:
- /intersection-observer/document-scrolling-element-root.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;

iframe {

  height: 250px;

  width: 150px;

  border: 0;

</style>

<iframe id="target-iframe" src="resources/iframe-no-root-subframe.html"></iframe>

<script>

var iframe = document.getElementById("target-iframe");

var target;

var root;

var entries = [];

iframe.onload = function() {

  runTestCycle(function() {

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

    target = iframe.contentDocument.getElementById("target");

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

    var observer = new IntersectionObserver(function(changes) {

      entries = entries.concat(changes)

    }, { root: iframe.contentDocument });

    observer.observe(target);

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

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

    runTestCycle(step0, "First rAF.");

  }, "Observer with explicit root which is the document.");

};

function step0() {

  let vw = iframe.contentDocument.documentElement.clientWidth;

  let vh = iframe.contentDocument.documentElement.clientHeight;

  // The target element is partially clipped by the iframe's root scroller, so

  // height of the intersection rect is (250 - 208) == 42.

  checkLastEntry(entries, 0, [8, 108, 208, 308, 8, 108, 208, 250, 0, vw, 0, vh, true]);

</script>