field-sizing-select-contain-size.html

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This WPT test may be referenced by the following Test IDs:
- /html/rendering/widgets/field-sizing-select-contain-size.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<link rel="help" href="https://drafts.csswg.org/css-ui-4/#field-sizing">

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

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

<body>

<style>

.disable-default {

  field-sizing: content;

.contain {

    contain: size;

</style>

<div id="container"></div>

<script>

const container = document.querySelector('#container');

const DISABLE = 'class="disable-default"';

// Tests for drop-down box ====================================================

test(() => {

  const s = '<select class="contain">><option>1<option>quick brown<option>fox</select>';

  container.innerHTML = s + s;

  container.lastElementChild.style.fieldSizing = 'content';

  const widthForContent1 = container.lastElementChild.offsetWidth;

  assert_greater_than_equal(container.firstElementChild.offsetWidth,

                      widthForContent1);

  container.lastElementChild.selectedIndex = 1;

  const widthForContentQuickBrown = container.lastElementChild.offsetWidth;

  assert_equals(widthForContentQuickBrown, widthForContent1);

}, 'dropdown: The width should not depend on the selected OPTION when contain:size is set');

// Tests for list box =========================================================

// Some platforms don't support list box rendering.

container.innerHTML = '<select></select><select multiple></select>';

if (container.firstElementChild.offsetHeight != container.lastElementChild.offsetHeight) {

  test(() => {

    container.innerHTML = `<select class="contain" multiple><option>fox</select>` +

                          `<select class="contain disable-default" multiple><option>fox</select>`;

    const former = container.firstElementChild;

    const latter = container.lastElementChild;

    const widthForOneItem = latter.offsetWidth;

    assert_equals(former.offsetWidth, widthForOneItem);

    latter.add(new Option('quick brown'));

    assert_equals(latter.offsetWidth, widthForOneItem);

  }, 'listbox: The width should not depend on content when contain:size is set');

</script>

</body>