<!DOCTYPE html>
<meta charset="utf-8">
<title>contain-intrinsic-size: auto none</title>
<link rel="author" title="Vladimir Levin" href="mailto:vmpstr@chromium.org">
<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#intrinsic-size-override">
<meta name="assert" content="Tests that 'contain-intrinsic-size: auto none' respects the auto keyword">

<style>
#target {
  width: max-content;
  height: max-content;
}
.cis-auto {
  contain-intrinsic-size: auto none;
}
.skip-contents {
  content-visibility: hidden;
}
.size-100-50 {
  width: 100px;
  height: 50px;
}
.size-75-25 {
  width: 75px;
  height: 25px;
}
</style>

<div id="log"></div>

<div id="parent">
  <div id="target">
    <div id="contents"></div>
  </div>
</div>

<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
const parent = document.getElementById("parent");
const target = document.getElementById("target");
const contents = document.getElementById("contents");

function checkSize(expectedWidth, expectedHeight, msg) {
  assert_equals(target.clientWidth, expectedWidth, msg + " - clientWidth");
  assert_equals(target.clientHeight, expectedHeight, msg + " - clientHeight");
}

function nextRendering() {
  return new Promise(resolve => {
    requestAnimationFrame(() => requestAnimationFrame(() => resolve()));
  });
}

function cleanup() {
  parent.className = "";
  target.className = "";
  contents.className = "";
  checkSize(0, 0, "Sizing after cleanup");
}

promise_test(async function() {
  this.add_cleanup(cleanup);
  target.className = "cis-auto skip-contents";
  contents.classList.add("size-100-50");
  checkSize(0, 0, "Size containment with no last remembered size");

  target.classList.remove("skip-contents");
  checkSize(100, 50, "Sizing normally");

  await nextRendering();
  target.classList.add("skip-contents");
  checkSize(100, 50, "Using last remembered size");

  contents.classList.remove("size-100-50");
  contents.classList.add("size-75-25");
  checkSize(100, 50, "Still using last remembered size");

  target.classList.remove("skip-contents");
  checkSize(75, 25, "Sizing normally with different size");

  target.classList.add("skip-contents");
  checkSize(100, 50, "Going back to last remembered size");

  target.classList.remove("skip-contents");
  await nextRendering();
  target.classList.add("skip-contents");
  checkSize(75, 25, "Using the new last remembered size");
}, "Basic usage");
</script>
