deep-nested-inline-size-containers.html

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This WPT test may be referenced by the following Test IDs:
- /css/css-contain/container-queries/deep-nested-inline-size-containers.html - WPT Dashboard Interop Dashboard

<!doctype html>

<title>CSS Container Queries Test: Deeply nested inline-size container queries</title>

<link rel="help" href="https://drafts.csswg.org/css-contain-3/#size-container">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="support/cq-testcommon.js"></script>

<style id="test_style">

  .container { container-type: inline-size; }

  #outer { width: 200px; }

</style>

<div id="outer" class="container"></div>

<script>

  setup(() => {

    assert_implements_container_queries();

    // Create 50 nested inline-size containers where a child container is 1px

    // narrower than its parent

    let sheet = test_style.sheet;

    let container = outer;

    for (let width = 200; width > 150; --width) {

      sheet.insertRule(`

        @container (width = ${width}px) {

          .container { max-width: ${width-1}px; }

`);

      let child = document.createElement("div");

      child.className = "container";

      container.appendChild(child);

      container = child;

});

  test(() => {

    let expected_width = 200;

    for (let container of document.querySelectorAll(".container"))

      assert_equals(container.offsetWidth, expected_width--);

  }, "Test that all container widths match");

</script>