svg-target-changes-position.html

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

<!DOCTYPE html>

<title>IntersectionObserver observing an SVG element changing position</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 width="100" height="10000">

  <!-- Ensure the svg bounds are unchanged with a white fill -->

  <rect x="0" y="0" width="100" height="10000" fill="white"/>

  <rect id="target" x="0" y="9000" width="100" height="100" fill="blue"/>

</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);

});

  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', '0');

  runTestCycle(step1, "Move SVG element up");

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

  // and root bounds.

  checkLastEntry(entries, 0, [

    // the 8 pixels comes from the html body padding.

    8, 100 + 8, 9000 + 8, 9000 + 8 + targetRect.height,

    0, 0, 0, 0,

    0, viewportWidth, 0, viewportHeight,

    false,

]);

function step1() {

  checkLastEntry(entries, 1, [

    8, 8 + targetRect.width, 8, 8 + targetRect.height,

    8, 8 + targetRect.width, 8, 8 + targetRect.height,

    0, viewportWidth, 0, viewportHeight,

    true,

]);

</script>