svg-viewbox.html - mozsearch

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This WPT test may be referenced by the following Test IDs:
- /intersection-observer/svg-viewbox.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>IntersectionObserver observing an SVG &lt;rect> element with changing 'transform'</title>

<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>

<svg id="container" width="10" height="10" viewBox="0 0 128 128" style="background: lightblue; position: absolute; top: 0; left: 0;">

    <rect id="target" x="0" y="0" width="128" height="128" fill="green"></rect>

</svg>

<script>

const viewportWidth = document.documentElement.clientWidth;

const viewportHeight = document.documentElement.clientHeight;

setup(() => {

  window.entries = [];

  window.target = document.getElementById("target");

  window.targetRect = target.getBoundingClientRect();

});

runTestCycle(function() {

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

  const observer = new IntersectionObserver(function(changes) {

    entries = entries.concat(changes);

  }, {root: container, threshold: [0, 0.5, 1]});

  observer.observe(target);

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

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

  runTestCycle(step0, "First rAF.");

});

function step0() {

  target.setAttribute('y', '-64');

  runTestCycle(step1, "change target's y property to -64)");

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

  // and root bounds.

  checkLastEntry(entries, 0, [

    0, targetRect.width, 0, targetRect.height,

    0, targetRect.width, 0, targetRect.height,

    0, 10, 0, 10,

    true,

]);

function step1() {

  target.style.transform = "translate(0, 50px)";

  checkLastEntry(entries, 1, [

    0, targetRect.width, -5, -5 + targetRect.height,

    0, targetRect.width, 0, -5 + targetRect.height,

    0, 10, 0, 10,

    true,

]);

</script>