File: layout-dependent-focus.html

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<!doctype html>
<title>CSS Container Queries: Input losing focus as a result of a size query</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>
  #container {
    container-type: inline-size;
    width: 200px;
  }
  #container.narrow {
    width: 100px;
  }
  @container (width = 100px) {
    #inner.hide { visibility: hidden; }
  }
</style>
<div id="outer">
  <div id="container">
    <input type="text" id="inner">
  </div>
</div>
<script>
  setup(() => assert_implements_container_queries());

  let hide_test = async_test("Verify that onblur is called on hidden input");
  onload = () => {
    inner.addEventListener("blur", () => hide_test.done());
    inner.focus();
    inner.className = "hide";
    container.className = "narrow";
    requestAnimationFrame(() => {
      requestAnimationFrame(() => {
        hide_test.step(() => assert_unreached("Event listener for 'blur' not called"));
      });
    });
  };
</script>