css/css-display/parsing/display-computed.html

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS Display: getComputedStyle().display</title>
<link rel="help" href="https://drafts.csswg.org/css2/visuren.html#display-prop">
<link rel="help" href="https://drafts.csswg.org/css-display/#the-display-properties">
<link rel="help" href="https://drafts.csswg.org/css-grid-1/#grid-containers">
<link rel="help" href="https://www.w3.org/TR/CSS2/visuren.html#dis-pos-flo">
<meta name="assert" content="position and float can change display computed value.">
<meta name="assert" content="display computed value is otherwise as specified.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/computed-testcommon.js"></script>
</head>
<body>
<div id="target"></div>
<script>
'use strict';

// https://drafts.csswg.org/css-grid-1/#grid-containers
test_computed_value("display", "grid");
test_computed_value("display", "inline-grid");

// https://drafts.csswg.org/css2/visuren.html#display-prop
test_computed_value("display", "inline");
test_computed_value("display", "block");
test_computed_value("display", "list-item");
test_computed_value("display", "inline-block");
test_computed_value("display", "table");
test_computed_value("display", "inline-table");
test_computed_value("display", "table-row-group");
test_computed_value("display", "table-header-group");
test_computed_value("display", "table-footer-group");
test_computed_value("display", "table-row");
test_computed_value("display", "table-column-group");
test_computed_value("display", "table-column");
test_computed_value("display", "table-cell");
test_computed_value("display", "table-caption");
test_computed_value("display", "none");

// https://drafts.csswg.org/css-flexbox-1/#flex-containers
test_computed_value("display", "flex");
test_computed_value("display", "inline-flex");

test_computed_value("display", "contents");

// https://www.w3.org/TR/CSS2/visuren.html#dis-pos-flo
function test_display_affected(property, value) {
  const target = document.getElementById('target');
  test(() => {
    target.style[property] = value;
    target.style.display = 'inline-table';
    assert_equals(getComputedStyle(target).display, 'table', 'inline-table -> block');

    const displayValues = [
      'inline',
      'table-row-group',
      'table-column',
      'table-column-group',
      'table-header-group',
      'table-footer-group',
      'table-row',
      'table-cell',
      'table-caption',
      'inline-block'
    ];

    for (let displayValue of displayValues) {
      target.style.display = displayValue;
      assert_equals(getComputedStyle(target).display, 'block', displayValue + ' -> block');
    }

    target.style.display = 'inline-flex';
    assert_equals(getComputedStyle(target).display, 'flex', 'inline-flex -> flex');

    target.style.display = 'inline-grid';
    assert_equals(getComputedStyle(target).display, 'grid', 'inline-grid -> grid');

    // Other values are not affected.
    target.style.display = 'list-item';
    assert_equals(getComputedStyle(target).display, 'list-item', 'list-item -> list-item');

    target.style.display = 'contents';
    assert_equals(getComputedStyle(target).display, 'contents', 'contents -> contents');

    target.style[property] = '';
    target.style.display = '';
  }, property + ' ' + value + ' affects computed display');
}

test_display_affected("position", "absolute");
test_display_affected("position", "fixed");
test_display_affected("float", "left");
test_display_affected("float", "right");
</script>
</body>
</html>