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

<!DOCTYPE html>
<title>Resolving 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;
  }
</style>

<iframe id=iframe></iframe>

<script>

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

function test_computed_value(value, expected) {
  test((t) => {
    t.add_cleanup(() => { doc.body.innerHTML = ''; });
    doc.body.innerHTML = `
      <style>
        * { margin: 0; }
        div { height: ${value}; }
      </style>
      <div></div>
    `;
    let div = doc.querySelector('div');
    assert_equals(win.getComputedStyle(div).height, expected);
  }, `${value} computes to ${expected}`);
}

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

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

test_computed_value('1dvw', '2px');
test_computed_value('10dvw', '20px');
test_computed_value('1dvh', '1px');
test_computed_value('10dvh', '10px');

test_computed_value('calc(1dvw + 1dvw)', '4px');
test_computed_value('calc(1dvw + 1dvh)', '3px');
test_computed_value('calc(1dvw + 100px)', '102px');
test_computed_value('max(1svw, 1svh)', '2px');
test_computed_value('min(1lvw, 1lvh)', '1px');
test_computed_value('calc(1dvw + 10%)', '12px');

</script>