legend-display.html

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This test has a WPT meta file that expects 4 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/legend-display.html - WPT Dashboard Interop Dashboard

<!doctype html>

<title>rendered legend and CSS display</title>

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

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

<style>

legend { width:initial; }

</style>

<fieldset><legend id="ref">x</legend></fieldset>

<fieldset><legend id="test">x</legend></fieldset>

<script>

  const refElm = document.querySelector('#ref');

  const refStyle = getComputedStyle(refElm);

  const testElm = document.querySelector('#test');

  const values = ['block', 'table', 'table-row-group', 'table-header-group', 'table-footer-group', 'table-row', 'table-cell',

                  'table-column-group', 'table-column', 'table-caption', 'list-item', 'flow', 'flow-root','run-in','inline',

                  'inline-block', 'inline-table', 'block ruby', 'ruby', 'ruby-base', 'ruby-text', 'ruby-base-container', 'ruby-text-container',

                  'grid', 'inline-grid', 'flex', 'inline-flex'];

  const extraStyle = ['', 'overflow:hidden', 'columns:1', 'overflow:hidden;columns:1'];

  for (const style of extraStyle) {

    for (const val of values) {

      test(() => {

        testElm.style.removeProperty('display');

        testElm.style = style;

        testElm.style.display = val;

        const computed = getComputedStyle(testElm);

        // Note that computed value is different from the used value.

        // E.g., if ruby is not supported, the following assertion will

        // fail as the computed value of display will be block.

        // If ruby is supported, computed.display will return "ruby",

        // but the used value is supposed to be "block ruby".

        // Also, 'flow' is serialized as 'block' for legacy reasons.

        let expected = val == 'flow' ? 'block' : val;

        assert_equals(computed.display, expected, `display: ${val} is not supported`);

        assert_equals(computed.width, refStyle.width, 'width');

        assert_equals(testElm.offsetLeft, refElm.offsetLeft, 'offsetLeft');

      }, `rendered legend with display: ${val}` + (style == '' ? '' : "; " + style));

</script>