scroll-state-snapped-wm.html | Explore in Territory

<!DOCTYPE html>
<title>@container: scroll-state(snapped) matching for writing-mode</title>
<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#container-rule">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/css-conditional/container-queries/support/cq-testcommon.js"></script>
<script src="/css/css-transitions/support/helper.js"></script>
<style>
  :root {
    scroll-snap-type: block mandatory;
  }
  body {
    margin: 0;
  }
  #filler-before {
    height: 200px;
  }
  #filler-after {
    height: 10000px;
  }
  #snapped {
    writing-mode: vertical-lr;
    container-name: initially-snapped;
    container-type: scroll-state;
    scroll-snap-align: start;
    width: 100px;
    height: 100px;
    background: teal;
  }

  @container initially-snapped scroll-state(snapped: block) {
    span { --snapped-logical: block }
  }
  @container initially-snapped scroll-state(snapped: inline) {
    span { --snapped-logical: inline }
  }
  @container initially-snapped scroll-state(snapped: x) {
    span { --snapped-physical: x }
  }
  @container initially-snapped scroll-state(snapped: y) {
    span { --snapped-physical: y }
  }
</style>
<div id="filler-before"></div>
<div id="snapped">
  <span id="target">My container is snapped</span>
</div>
<div id="filler-after"></div>
<script>
  setup(() => assert_implements_container_queries());

  promise_test(async t => {
    await waitForAnimationFrames(2);
    assert_equals(getComputedStyle(target).getPropertyValue("--snapped-logical"), "inline");
    assert_equals(getComputedStyle(target).getPropertyValue("--snapped-physical"), "y");
    assert_equals(document.documentElement.scrollTop, 200);
  }, "Check scroll-state(snapped) matching for vertical writing-mode");

  promise_test(async t => {
    snapped.style.writingMode = "horizontal-tb";
    await waitForAnimationFrames(2);
    assert_equals(getComputedStyle(target).getPropertyValue("--snapped-logical"), "block");
    assert_equals(getComputedStyle(target).getPropertyValue("--snapped-physical"), "y");
    assert_equals(document.documentElement.scrollTop, 200);
  }, "Check scroll-state(snapped) matching dynamically changing to horizontal writing-mode");

</script>
chromium/third_party/blink/web_tests/wpt_internal/css/css-conditional/container-queries/scroll-state-snapped-wm.html
