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<!DOCTYPE html>
<title>IntersectionObserver observing an SVG &lt;g> element</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>
<style>
.spacer {
  height: calc(100vh + 100px);
}
</style>
<svg viewBox="0 0 200 100" width="400">
  <g id="target">
    <rect x="50" y="25" width="100" height="50" fill="blue"/>
  </g>
</svg>
<script>
const viewportWidth = document.documentElement.clientWidth;
const viewportHeight = document.documentElement.clientHeight;

setup(() => {
  window.entries = [];
  window.target = document.getElementById("target");
  window.targetRect = target.getBoundingClientRect();
  window.rect = document.querySelector("#target > rect");
});

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() {
  rect.style.transform = "translate(0, 150px)";
  runTestCycle(step1, "descendant rect translated down by 150 units (out of SVG viewport)");
  // The numbers in brackets are target client rect; intersection rect;
  // and root bounds.
  checkLastEntry(entries, 0, [
    108, 108 + targetRect.width, 58, 58 + targetRect.height,
    108, 108 + targetRect.width, 58, 58 + targetRect.height,
    0, viewportWidth, 0, viewportHeight,
    true,
  ]);
}

function step1() {
  rect.style.transform = "translate(0, 50px)";
  runTestCycle(step2, "descendant rect translated down by 100 units");
  checkLastEntry(entries, 1, [
    108, 108 + targetRect.width, 8 + (25 + 150) * 2, 8 + (25 + 150) * 2 + targetRect.height,
    0, 0, 0, 0,
    0, viewportWidth, 0, viewportHeight,
    false,
  ]);
}

function step2() {
  rect.style.transform = "";
  checkLastEntry(entries, 2, [
    108, 108 + targetRect.width, 8 + (25 + 50) * 2, 8 + (25 + 50) * 2 + targetRect.height,
    108, 108 + targetRect.width, 8 + (25 + 50) * 2, 8 + (25 + 50) * 2 + targetRect.height / 2,
    0, viewportWidth, 0, viewportHeight,
    true,
  ]);
}
</script>