Stable sortable table

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<html lang="en">
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <meta
      http-equiv="Content-Security-Policy"
      content="default-src 'none'; style-src 'unsafe-inline'; script-src 'unsafe-inline'; img-src data: blob:; connect-src 'none'; form-action 'none'; object-src 'none'; base-uri 'none'"
    />
    <title>MRHTML | A little order, please.</title>
    <style>
      :root {
        font-family: Arial, Helvetica, sans-serif;
        color-scheme: light;
        --ink: #192f34;
        --muted: #56666a;
        --paper: #f6f5f0;
        --line: #cdd5d0;
        --accent: #186354;
        --soft: #e7efe5;
        --mono: Consolas, 'Liberation Mono', monospace;
      }
      * {
        box-sizing: border-box;
      }
      html {
        scroll-padding-top: 90px;
      }
      body {
        margin: 0;
        background: var(--paper);
        color: var(--ink);
        line-height: 1.6;
      }
      h1,
      h2,
      h3,
      p {
        margin: 0;
      }
      h1,
      h2,
      h3 {
        font-weight: 500;
        letter-spacing: -0.045em;
        line-height: 1.1;
      }
      h1 {
        font-size: clamp(38px, 5.5vw, 65px);
      }
      h2 {
        font-size: 29px;
      }
      h3 {
        font-size: 21px;
      }
      p {
        overflow-wrap: anywhere;
      }
      a {
        color: var(--accent);
        text-underline-offset: 4px;
      }
      button,
      select {
        font: inherit;
        color: inherit;
      }
      button {
        cursor: pointer;
      }
      button,
      a,
      summary {
        touch-action: manipulation;
      }
      button:focus-visible,
      a:focus-visible,
      select:focus-visible,
      [tabindex]:focus-visible,
      summary:focus-visible {
        outline: 3px solid #a94823;
        outline-offset: 4px;
      }
      [hidden] {
        display: none !important;
      }
      .wrap {
        width: min(1050px, calc(100% - 64px));
        margin-inline: auto;
      }
      .header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        gap: 20px;
        padding: 28px 0;
        border-bottom: 1px solid var(--line);
      }
      .brand {
        font-size: 15px;
        font-weight: 700;
        display: flex;
        align-items: center;
        gap: 10px;
        letter-spacing: -0.5px;
      }
      .mark {
        display: grid;
        place-items: center;
        width: 28px;
        height: 28px;
        background: var(--accent);
        color: #fff;
        font-weight: bold;
        font-size: 18px;
      }
      .header > p,
      .eyebrow,
      .small {
        font: 10px/1.7 var(--mono);
        letter-spacing: 0.03em;
      }
      .header > p {
        color: var(--muted);
      }
      main {
        padding-block: 43px 50px;
      }
      .intro {
        margin-bottom: 30px;
        max-width: 720px;
      }
      .eyebrow {
        color: var(--accent);
        margin-bottom: 13px;
      }
      .intro > p:last-child {
        font-size: 15px;
        max-width: 570px;
        color: var(--muted);
        margin-top: 18px;
      }
      .surface {
        background: #fff;
        border: 1px solid var(--line);
        border-radius: 14px;
        box-shadow: 0 12px 32px #263e3010;
      }
      .button {
        border: 1px solid var(--accent);
        background: var(--accent);
        color: #fff;
        padding: 10px 16px;
        min-height: 43px;
        border-radius: 7px;
        font-size: 13px;
        font-weight: 600;
      }
      .button.secondary {
        background: #fff;
        color: var(--accent);
        border-color: #a9bbb0;
      }
      .button[aria-disabled='true'],
      button:disabled {
        background: #edf0e9;
        color: #5d695f;
        border-color: #c9d1c4;
        cursor: default;
      }
      .status {
        font-size: 12px;
        color: var(--muted);
        min-height: 22px;
      }
      .note {
        font-size: 12px;
        color: var(--muted);
        margin-top: 20px;
        max-width: 75ch;
      }
      .footer {
        display: flex;
        justify-content: space-between;
        gap: 20px;
        padding-block: 22px;
        border-top: 1px solid var(--line);
        font-size: 10px;
        color: var(--muted);
      }
      .sr-only {
        position: absolute;
        width: 1px;
        height: 1px;
        padding: 0;
        margin: -1px;
        overflow: hidden;
        clip: rect(0, 0, 0, 0);
        white-space: nowrap;
        border: 0;
      }
      noscript p {
        padding: 15px;
        background: #e8ece2;
        border-left: 3px solid var(--accent);
        font-size: 13px;
        margin-bottom: 20px;
      }
      code,
      kbd {
        font: 12px var(--mono);
      }
      kbd {
        border: 1px solid #bcc7bd;
        border-radius: 4px;
        padding: 2px 5px;
        background: #fff;
      }
      button:disabled:focus {
        outline: none;
      }
      @media (max-width: 600px) {
        .wrap {
          width: calc(100% - 36px);
        }
        .header {
          padding-block: 22px;
        }
        .header > p {
          font-size: 8px;
          max-width: 105px;
          text-align: right;
        }
        .brand {
          font-size: 13px;
          gap: 8px;
        }
        main {
          padding-block: 30px 35px;
        }
        .intro {
          margin-bottom: 26px;
        }
        .intro > p:last-child {
          font-size: 14px;
        }
        .eyebrow {
          font-size: 9px;
        }
        h1 {
          font-size: 40px;
        }
        .footer {
          flex-wrap: wrap;
          font-size: 9px;
        }
      }
      @media (max-width: 350px) {
        h1 {
          font-size: 35px;
        }
        .button {
          padding: 10px 12px;
          font-size: 12px;
        }
      }
      @media (prefers-reduced-motion: reduce) {
        *,
        *::before,
        *::after {
          animation: none !important;
          transition: none !important;
          scroll-behavior: auto !important;
        }
      }

      .table-surface {
        overflow: hidden;
      }
      .table-heading {
        padding: 24px 27px;
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 20px;
        background: #e7efe5;
      }
      .table-heading h2 {
        font-size: 26px;
      }
      .table-heading .small {
        color: #435d4c;
        font-size: 9px;
      }
      .table-scroll {
        overflow-x: auto;
      }
      table {
        width: 100%;
        border-collapse: collapse;
        text-align: left;
      }
      caption {
        text-align: left;
        padding: 18px 27px;
        color: var(--muted);
        font-size: 12px;
      }
      th,
      td {
        border-bottom: 1px solid #e0e5dd;
        padding: 18px 27px;
        font-size: 14px;
      }
      thead {
        background: #f4f6f1;
      }
      thead th {
        padding: 0;
        font-weight: 500;
      }
      thead button {
        border: 0;
        width: 100%;
        min-height: 56px;
        display: flex;
        gap: 16px;
        align-items: center;
        justify-content: space-between;
        padding: 15px 27px;
        background: transparent;
        font-size: 12px;
        font-weight: 600;
        text-align: left;
      }
      thead button:disabled {
        background: transparent;
      }
      thead button:focus-visible {
        outline-offset: -4px;
      }
      thead span {
        color: var(--accent);
      }
      tbody th {
        font-weight: 500;
        width: 50%;
      }
      td {
        font-size: 12px;
        white-space: nowrap;
      }
      tbody tr:last-child > * {
        border-bottom: 0;
      }
      #sort-status {
        padding: 18px 27px;
        border-top: 1px solid var(--line);
      }
      @media (max-width: 600px) {
        .table-heading {
          padding: 20px;
        }
        .table-heading .small {
          font-size: 7px;
        }
        caption {
          padding: 16px 18px;
        }
        th,
        td {
          padding: 17px 12px;
        }
        tbody th {
          font-size: 13px;
        }
        td {
          font-size: 11px;
          white-space: normal;
        }
        thead button {
          padding: 14px 12px;
          font-size: 11px;
          gap: 8px;
        }
        #sort-status {
          padding: 16px 18px;
          font-size: 11px;
        }
      }
    </style>
  </head>
  <body>
    <header class="header wrap">
      <span class="brand"
        ><span class="mark" aria-hidden="true">m.</span>MRHTML / Workshop</span
      >
      <p>SMALL PATTERNS.<br />CONSIDERED DETAILS.</p>
    </header>
    <main class="wrap">
      <div class="intro">
        <p class="eyebrow">01 / SORTABLE TABLE</p>
        <h1>A little order, please.</h1>
        <p>
          Explore a fictional workshop reading list. Sort by title, reading
          time, or review date. Equal values keep their original order.
        </p>
      </div>
      <noscript
        ><p>
          All entries remain readable. Turn on JavaScript to sort the table.
        </p></noscript
      >
      <div class="surface table-surface">
        <div class="table-heading">
          <h2>Reading desk</h2>
          <span class="small">6 SAMPLE ENTRIES</span>
        </div>
        <div
          class="table-scroll"
          role="region"
          aria-label="Sortable reading list"
          tabindex="0"
        >
          <table>
            <caption>
              Workshop reading list.
              <span id="sort-help">All six entries are shown.</span>
            </caption>
            <thead>
              <tr>
                <th scope="col">
                  <button
                    type="button"
                    data-column="0"
                    data-type="text"
                    disabled
                  >
                    Title <span aria-hidden="true">↕</span>
                  </button>
                </th>
                <th scope="col">
                  <button
                    type="button"
                    data-column="1"
                    data-type="number"
                    disabled
                  >
                    Minutes <span aria-hidden="true">↕</span>
                  </button>
                </th>
                <th scope="col">
                  <button
                    type="button"
                    data-column="2"
                    data-type="date"
                    disabled
                  >
                    Reviewed <span aria-hidden="true">↕</span>
                  </button>
                </th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <th scope="row">Make room for focus</th>
                <td data-value="12">12 min</td>
                <td data-value="2026-09-08">
                  <time datetime="2026-09-08">8 Sep 2026</time>
                </td>
              </tr>
              <tr>
                <th scope="row">A useful first draft</th>
                <td data-value="5">5 min</td>
                <td data-value="2026-08-21">
                  <time datetime="2026-08-21">21 Aug 2026</time>
                </td>
              </tr>
              <tr>
                <th scope="row">Working in the open</th>
                <td data-value="12">12 min</td>
                <td data-value="2026-09-02">
                  <time datetime="2026-09-02">2 Sep 2026</time>
                </td>
              </tr>
              <tr>
                <th scope="row">Notes for the next person</th>
                <td data-value="8">8 min</td>
                <td data-value="2026-09-08">
                  <time datetime="2026-09-08">8 Sep 2026</time>
                </td>
              </tr>
              <tr>
                <th scope="row">Small steps, clear choices</th>
                <td data-value="20">20 min</td>
                <td data-value="2026-07-14">
                  <time datetime="2026-07-14">14 Jul 2026</time>
                </td>
              </tr>
              <tr>
                <th scope="row">An unfinished question</th>
                <td data-value="">Not set</td>
                <td data-value="">Not reviewed</td>
              </tr>
            </tbody>
          </table>
        </div>
        <p
          id="sort-status"
          class="status"
          role="status"
          aria-live="polite"
          aria-atomic="true"
        >
          Original order. Missing values always sort last.
        </p>
      </div>
      <p class="note">
        Column buttons toggle ascending and descending order. This example sorts
        the existing rows; it does not load records or save your preference.
      </p>
    </main>
    <footer class="footer wrap">
      <span>MRHTML / Original runnable example</span
      ><span>Local content. No network required.</span>
    </footer>
    <script>
      (() => {
        'use strict';

        const body = document.querySelector('tbody');
        const records = [...body.rows].map((row, index) => ({ row, index }));
        const buttons = [...document.querySelectorAll('[data-column]')];
        const collator = new Intl.Collator('en', {
          sensitivity: 'base',
          numeric: false,
        });
        let column = null,
          ascending = true;
        function value(record, index, type) {
          const cell = record.row.cells[index];
          const raw =
            cell.dataset.value === undefined
              ? cell.textContent.trim()
              : cell.dataset.value;
          if (raw === '') return null;
          if (type === 'number') {
            const number = Number(raw);
            return Number.isFinite(number) ? number : null;
          }
          if (type === 'date') {
            const number = Date.parse(raw);
            return Number.isFinite(number) ? number : null;
          }
          return raw;
        }
        buttons.forEach((button) => {
          button.addEventListener('click', () => {
            const next = Number(button.dataset.column);
            ascending = column === next ? !ascending : true;
            column = next;
            const sorted = [...records].sort((a, b) => {
              const av = value(a, column, button.dataset.type),
                bv = value(b, column, button.dataset.type);
              if (av === null || bv === null)
                return av === bv ? a.index - b.index : av === null ? 1 : -1;
              const compared =
                button.dataset.type === 'text'
                  ? collator.compare(av, bv)
                  : av - bv;
              return compared === 0
                ? a.index - b.index
                : compared * (ascending ? 1 : -1);
            });
            sorted.forEach((record) => body.append(record.row));
            buttons.forEach((item) => {
              item.closest('th').removeAttribute('aria-sort');
              item.querySelector('span').textContent = '↕';
            });
            button
              .closest('th')
              .setAttribute(
                'aria-sort',
                ascending ? 'ascending' : 'descending',
              );
            button.querySelector('span').textContent = ascending ? '↑' : '↓';
            document.querySelector('#sort-status').textContent =
              `Sorted by ${button.childNodes[0].textContent.trim().toLowerCase()}, ${ascending ? 'ascending' : 'descending'}. ${records.length} entries. Missing values last.`;
          });
          button.disabled = false;
        });
        document.querySelector('#sort-help').textContent =
          'Column buttons change the sort order.';
      })();
    </script>
  </body>
</html>