viewport-units-writing-mode.html

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

<!DOCTYPE html>

<title>Viewport units are responsive to writing-mode changes</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_writing_mode(value, expected_pre, expected_post) {

  test((t) => {

    t.add_cleanup(() => { doc.body.innerHTML = ''; });

    doc.body.innerHTML = `

      <style>

        div {

          writing-mode: initial;

          height: ${value};

        .vertical {

          writing-mode: vertical-rl;

      </style>

      <div></div>

`;

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

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

    // The writing-mode of the document element does not matter.

    t.add_cleanup(() => { doc.documentElement.classList.remove('vertical'); })

    doc.documentElement.classList.add('vertical');

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

    // The writing-mode of the target element is what matters.

    div.classList.add('vertical');

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

  }, `${value} computes to ${expected_post} with vertical writing-mode`);

test_writing_mode('100vi', '200px', '100px');

test_writing_mode('100svi', '200px', '100px');

test_writing_mode('100lvi', '200px', '100px');

test_writing_mode('100dvi', '200px', '100px');

test_writing_mode('100vb', '100px', '200px');

test_writing_mode('100svb', '100px', '200px');

test_writing_mode('100lvb', '100px', '200px');

test_writing_mode('100dvb', '100px', '200px');

</script>