Latency lab boxplots

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Illustrative sample content and data; no real accounts, purchases or bookings. -->
<main>
  <header class="intro">
    <div>
      <div class="kicker">DATA STORIES / SAMPLE DATA</div>
      <h1>Latency lab boxplots</h1>
      <p>
        Compare median, quartiles and whiskers across response-time samples. Statistics are
        calculated from the actual arrays shown in the data table.
      </p>
    </div>
    <span class="badge">INTERACTIVE SVG</span>
  </header>
  <section class="panel">
    <svg
      id="chart"
      viewBox="0 0 700 290"
      role="img"
      aria-label="Response-time box plots for four services"
    ></svg>
    <div class="toolbar">
      <button id="change">Apply simulated optimization</button
      ><span class="badge">MILLISECONDS / 20 SAMPLES EACH</span>
    </div>
    <output id="status" class="status" aria-live="polite"></output>
    <details class="data-table">
      <summary>View data table</summary>
      <div class="table-scroll"><table id="data-table"></table></div>
    </details>
  </section>
  <footer>Illustrative data · no external services · keyboard-accessible controls</footer>
</main>

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(() => {
  "use strict";
  const $ = (s) => document.querySelector(s),
    $$ = (s) => [...document.querySelectorAll(s)],
    status = (t) => {
      const el = $("#status");
      if (el) el.textContent = t;
    },
    clamp = (n, a, b) => Math.max(a, Math.min(b, n));
  const reduced = matchMedia("(prefers-reduced-motion: reduce)").matches;
  const ns = "http://www.w3.org/2000/svg";
  function svg(tag, attrs = {}, text) {
    const el = document.createElementNS(ns, tag);
    for (const [k, v] of Object.entries(attrs)) el.setAttribute(k, String(v));
    if (text !== undefined) el.textContent = text;
    return el;
  }
  function table(headers, rows) {
    const t = $("#data-table");
    if (!t) return;
    t.replaceChildren();
    const caption = document.createElement("caption");
    caption.textContent = "Illustrative sample data";
    t.append(caption);
    const head = t.createTHead().insertRow();
    headers.forEach((v) => {
      const th = document.createElement("th");
      th.scope = "col";
      th.textContent = v;
      head.append(th);
    });
    const body = t.createTBody();
    rows.forEach((row) => {
      const r = body.insertRow();
      row.forEach((v) => (r.insertCell().textContent = String(v)));
    });
  }
  function selectButtons(selector, callback) {
    $$(selector).forEach((b) =>
      b.addEventListener("click", () => {
        $$(selector).forEach((x) => x.setAttribute("aria-pressed", String(x === b)));
        callback(b);
      }),
    );
  }

  const colors = ["#82b6ff", "#72dbc2", "#c5a4ff", "#f7bf7c", "#fa92b8", "#acd884"];
  let optimized = false;
  const names = ["Auth", "Search", "Assets", "Reports"];
  function draw() {
    const s = $("#chart");
    s.replaceChildren();
    const q = (arr, p) => {
      const i = (arr.length - 1) * p,
        a = Math.floor(i);
      return arr[a] + (arr[Math.ceil(i)] - arr[a]) * (i - a);
    };
    const rows = [];
    names.forEach((name, i) => {
      const samples = Array.from(
          { length: 20 },
          (_, j) => (18 + i * 15 + ((j * 17 + i * 13) % 61)) * (optimized ? 0.72 : 1),
        ).sort((a, b) => a - b),
        v = [samples[0], q(samples, 0.25), q(samples, 0.5), q(samples, 0.75), samples.at(-1)],
        x = 110 + i * 155,
        sy = (n) => 245 - n * 1.65;
      s.append(
        svg("line", {
          x1: x,
          y1: sy(v[0]),
          x2: x,
          y2: sy(v[4]),
          stroke: colors[i],
          "stroke-width": 2,
        }),
      );
      [v[0], v[4]].forEach((n) =>
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          svg("line", {
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            y1: sy(n),
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            y2: sy(n),
            stroke: colors[i],
            "stroke-width": 2,
          }),
        ),
      );
      s.append(
        svg("rect", {
          x: x - 35,
          y: sy(v[3]),
          width: 70,
          height: sy(v[1]) - sy(v[3]),
          fill: colors[i],
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          stroke: colors[i],
          rx: 3,
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      );
      s.append(
        svg("line", {
          x1: x - 35,
          y1: sy(v[2]),
          x2: x + 35,
          y2: sy(v[2]),
          stroke: colors[i],
          "stroke-width": 3,
        }),
      );
      s.append(svg("text", { x, y: 273, "text-anchor": "middle" }, name));
      s.append(
        svg("text", { x, y: sy(v[4]) - 10, "text-anchor": "middle" }, "median " + v[2].toFixed(1)),
      );
      samples.forEach((n, j) => rows.push([name, j + 1, n.toFixed(1)]));
    });
    table(["Service", "Sample", "Latency (ms)"], rows);
  }
  $("#change").addEventListener("click", () => {
    optimized = !optimized;
    draw();
    status(
      optimized
        ? "Simulated optimization reduces every sample by 28%."
        : "Original response-time sample arrays restored.",
    );
  });
  draw();
})();