viewport-units-extreme-scale.html

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This WPT test may be referenced by the following Test IDs:
- /css/css-values/viewport-units-extreme-scale.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>Scaling with viewport units</title>

<link rel="help" href="https://drafts.csswg.org/css-values-4/#viewport-relative-lengths">

<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1860338">

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

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

<iframe id=iframe width=640 height=480></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 = `

      <!doctype html>

      <style>

        * { margin: 0; }

        body { height: 100%; }

        div { height: ${value}; }

      </style>

      <div></div>

`;

    let div = doc.querySelector('div');

    assert_equals(win.getComputedStyle(div).height, expected);

  }, `${value} computes to ${expected}`);

// Check the basic units are as expected

test_computed_value('100vw', '640px');

test_computed_value('100vh', '480px');

// Try some calculations involving extreme scaling

test_computed_value('calc((1vw - 6.3999px) * 10000000)', '1000px');

test_computed_value('calc((100vh - 479px) * 60000)', '60000px');

</script>