css/css-values/viewport-units-invalidation.html

<!DOCTYPE html>
<title>Invalidation of viewport units</title>
<link rel="help" href="https://drafts.csswg.org/css-values-4/#viewport-relative-lengths">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<style>
  iframe {
    width: 200px;
    height: 100px;
  }

  iframe.resize {
    width: 400px;
    height: 300px;
  }
</style>

<iframe id=iframe></iframe>

<script>

const doc = iframe.contentDocument;
const win = iframe.contentWindow;

function test_invalidation_value(value, expected_pre, expected_post) {
  test((t) => {
    t.add_cleanup(() => { doc.body.innerHTML = ''; });
    doc.body.innerHTML = `<div style="height: ${value};"></div>`;
    let div = doc.querySelector('div');
    assert_equals(win.getComputedStyle(div).height, expected_pre);

    t.add_cleanup(() => { iframe.classList.remove('resize'); })
    iframe.classList.add('resize');
    assert_equals(win.getComputedStyle(div).height, expected_post);
  }, `${value} computes to ${expected_post} after frame resize`);
}

test_invalidation_value('100vw', '200px', '400px');
test_invalidation_value('100vi', '200px', '400px');
test_invalidation_value('100vmax', '200px', '400px');
test_invalidation_value('100svw', '200px', '400px');
test_invalidation_value('100svi', '200px', '400px');
test_invalidation_value('100svmax', '200px', '400px');
test_invalidation_value('100lvw', '200px', '400px');
test_invalidation_value('100lvi', '200px', '400px');
test_invalidation_value('100lvmax', '200px', '400px');
test_invalidation_value('100dvw', '200px', '400px');
test_invalidation_value('100dvi', '200px', '400px');
test_invalidation_value('100dvmax', '200px', '400px');

test_invalidation_value('100vh', '100px', '300px');
test_invalidation_value('100vb', '100px', '300px');
test_invalidation_value('100vmin', '100px', '300px');
test_invalidation_value('100svh', '100px', '300px');
test_invalidation_value('100svb', '100px', '300px');
test_invalidation_value('100svmin', '100px', '300px');
test_invalidation_value('100lvh', '100px', '300px');
test_invalidation_value('100lvb', '100px', '300px');
test_invalidation_value('100lvmin', '100px', '300px');
test_invalidation_value('100dvh', '100px', '300px');
test_invalidation_value('100dvb', '100px', '300px');
test_invalidation_value('100dvmin', '100px', '300px');

</script>