chromium/third_party/blink/web_tests/external/wpt/css/css-tables/support/base.css

/* custom table tags */

    x-table { display: table; }
    x-colgroup { display: table-column-group; }
    x-col { display: table-column; }
    x-tbody { display: table-row-group; }
    x-thead { display: table-header-group; }
    x-tfoot { display: table-footer-group; }
    x-tr { display: table-row; }
    x-td { display: table-cell; }
    x-caption { display: table-caption; }

/* layout of the page */

    hr + p { font-weight: bold; margin-bottom: 0; }
    p + p { margin-top: 0; }

    html, body { padding: 0; margin: 0; }
    main, #log { padding: 10px; width: 50%; box-sizing: border-box; }
    main { float: left; }
    #log { float: right; background: #eee; }