test_query_container_for.html

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<!doctype html>

<title>Test for bug 1789191</title>

<script src="/tests/SimpleTest/SimpleTest.js"></script>

<link rel="stylesheet" href="/tests/SimpleTest/test.css"/>

<style>

@container (min-width: 0px) {

@container name (min-width: 0px) {

@container (min-height: 0px) {

div {

  width: 100px;

  height: 100px;

  background-color: blue;

  margin: 10px;

.container-height {

  container-type: size;

.container-unnamed {

  container-type: inline-size;

.container-named {

  container-type: inline-size;

  container-name: name;

</style>

<div id="child1"></div>

<div class="container-height" id="container1">

  <div class="container-named" id="container2">

    <div class="container-unnamed" id="container3">

      <div id="child2"></div>

    </div>

  </div>

</div>

<script>

  let sheet = document.querySelector("style").sheet;

  let withoutFilter = SpecialPowers.wrap(sheet.cssRules[0]);

  let withFilter = SpecialPowers.wrap(sheet.cssRules[1]);

  let heightQuery = SpecialPowers.wrap(sheet.cssRules[2]);

  // Container query selection requires up-to-date layout information.

  document.body.getBoundingClientRect();

  is(withoutFilter.queryContainerFor(child1), null, "No filter, no container");

  is(withFilter.queryContainerFor(child1), null, "Filter, no container");

  is(heightQuery.queryContainerFor(child1), null, "Height, no container");

  is(SpecialPowers.unwrap(withoutFilter.queryContainerFor(child2)), container3, "No filter, container");

  is(SpecialPowers.unwrap(withFilter.queryContainerFor(child2)), container2, "Filter");

  is(SpecialPowers.unwrap(heightQuery.queryContainerFor(child2)), container1, "Height");

</script>