diff --git a/profiles/w3c.js b/profiles/w3c.js
index 50537315c9..464490caf4 100644
--- a/profiles/w3c.js
+++ b/profiles/w3c.js
@@ -54,6 +54,8 @@ const modules = [
   import("../src/core/data-tests.js"),
   import("../src/core/list-sorter.js"),
   import("../src/core/highlight-vars.js"),
+  import("../src/core/dfn-panel.js"),
+  import("../src/core/sortable-table.js"),
   import("../src/core/data-type.js"),
   import("../src/core/algorithms.js"),
   import("../src/core/anchor-expander.js"),
diff --git a/src/core/sortable-table.js b/src/core/sortable-table.js
new file mode 100644
index 0000000000..ed9587078a
--- /dev/null
+++ b/src/core/sortable-table.js
@@ -0,0 +1,28 @@
+// @ts-check
+import css from "../styles/sortable-table.css.js";
+import { fetchBase } from "./text-loader.js";
+
+export const name = "core/sortable-table";
+
+export async function run() {
+  if (!document.querySelector("table.sortable")) {
+    return;
+  }
+
+  const style = document.createElement("style");
+  style.textContent = css;
+  document.head.insertBefore(style, document.querySelector("link"));
+
+  const script = document.createElement("script");
+  script.id = "respec-dfn-panel";
+  script.textContent = await loadScript();
+  document.body.append(script);
+}
+
+async function loadScript() {
+  try {
+    return (await import("text!./sortable-table.runtime.js")).default;
+  } catch {
+    return fetchBase("./src/core/sortable-table.runtime.js");
+  }
+}
diff --git a/src/core/sortable-table.runtime.js b/src/core/sortable-table.runtime.js
new file mode 100644
index 0000000000..f5ae4b68cb
--- /dev/null
+++ b/src/core/sortable-table.runtime.js
@@ -0,0 +1,82 @@
+if (document.respec) {
+  document.respec.ready.then(setupSortableTable);
+} else {
+  setupSortableTable();
+}
+
+function setupSortableTable() {
+  /** @type {WeakMap<HTMLTableElement, WeakMap<HTMLTableCellElement, -1 | 1>>} */
+  const STATE = new WeakMap();
+
+  /**
+   * @param {HTMLTableCellElement} th
+   * @param {-1 | 0 | 1} dir
+   */
+  const createOrUpdateButton = (th, dir) => {
+    const textValue = [" descending", "", " ascending"][dir + 1];
+    const iconValue = ["▼", "▲/▼", "▲"][dir + 1]; // TODO: fix these mappings
+    const label = th.dataset.text || th.textContent;
+    if (!th.dataset.text) th.dataset.text = label;
+
+    const button =
+      th.querySelector("button") || document.createElement("button");
+    const text = `Sort${textValue} by ${label}`;
+    button.title = text;
+    button.setAttribute("aria-label", text);
+    button.textContent = iconValue;
+    return button;
+  };
+
+  /** @type {NodeListOf<HTMLTableElement>} */
+  const tables = document.querySelectorAll("table.sortable");
+  for (const table of tables) {
+    for (const th of table.tHead.querySelectorAll("th")) {
+      th.append(createOrUpdateButton(th, 0));
+    }
+  }
+
+  /** @type {(el: MouseEvent)=> HTMLTableCellElement | null}  */
+  const getTrigger = ev => {
+    if (!(ev.target instanceof HTMLElement)) return null;
+    const el = ev.target;
+    if (el.localName === "th") {
+      return el;
+    }
+    if (el.localName === "button" && el.parentElement.localName === "th") {
+      return el.parentElement;
+    }
+    return null;
+  };
+
+  document.addEventListener("click", ev => {
+    const th = getTrigger(ev);
+    if (!th) return;
+
+    /** @type {HTMLTableElement | null}  */
+    const table = th.closest("table.sortable");
+    if (!table) return;
+
+    ev.preventDefault();
+
+    const state =
+      STATE.get(table) || STATE.set(table, new WeakMap()).get(table);
+    const direction = state.get(th) === 1 ? -1 : 1; // -1: ascending, 1: descending
+    state.set(th, direction);
+
+    createOrUpdateButton(th, direction);
+
+    const tbody = table.tBodies[0];
+    const headers = th.closest("tr").cells;
+    const colIndex = Array.from(headers).findIndex(node => node === th);
+    const rows = Array.from(tbody.rows).sort((a, b) => {
+      const x = a.cells[colIndex].textContent.trimStart();
+      const y = b.cells[colIndex].textContent.trimStart();
+      return direction * x.localeCompare(y);
+    });
+
+    /** @type {typeof tbody}  */
+    const tbodyCone = tbody.cloneNode(false);
+    tbodyCone.append(...rows);
+    tbody.replaceWith(tbodyCone);
+  });
+}
diff --git a/src/styles/sortable-table.css.js b/src/styles/sortable-table.css.js
new file mode 100644
index 0000000000..e29e64ddf7
--- /dev/null
+++ b/src/styles/sortable-table.css.js
@@ -0,0 +1,24 @@
+const css = String.raw;
+
+export default css`
+  .sortable th {
+    vertical-align: middle;
+    white-space: nowrap;
+  }
+
+  .sortable th button {
+    background: inherit;
+    color: inherit;
+    border: none;
+    font-size: 0.6em;
+    padding: 0.5em;
+  }
+
+  .sortable th button:hover {
+    cursor: pointer;
+  }
+
+  .sortable th button:focus {
+    outline: 1px solid;
+  }
+`;