RenderingMicro/benchmark.html at main · progers/RenderingMicro · GitHub

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<!DOCTYPE html>
<meta name="viewport" content="width=device-width">
<html>
<head>
  <title>Rendering Micro Benchmark</title>
</head>
<body>
  <div id="benchmarkContainer">
    <style>
      body {
        font-family: sans-serif;
      }
      #container {
        display: flex;
      }
      #input, #preview {
        width: 50%;
        padding: 10px;
        border: 1px solid #ccc;
      }
      #input {
        white-space: pre;
        overflow-x: auto;
      }
      #preview {
        background-color: #f5f5f5;
      }
      #preview h4 {
        margin-bottom: 5px;
      }
      #preview iframe {
        border: none;
        width: 100%;
        height: 100px;
      }
      button {
        margin: 10px 0;
        padding: 8px 16px;
      }
      .warning {
        padding: 10px;
        background: orange;
        color: white;
        margin-bottom: 15px;
      }
      table {
        border-collapse: collapse;
      }
      th, td {
        border: 1px solid black;
        padding: 8px;
      }
    </style>
    <h1>Rendering Micro Benchmark</h1>
    <p>Enter HTML snippets below to benchmark their performance.</p>

    <div id="container">
      <textarea id="input" rows="10"></textarea>
      <div id="preview"></div>
    </div>

    <button title="Copy a persistent URL" id="copyLink">Copy Link</button>
    <button id="run">Run Benchmark</button>

    <div id="results"></div>
  </div>

  <script type="module">
    import { benchmark, Snippet, TimeStats } from './src/runner.js';
    import { compress, decompress } from './src/gzip.js';

    onload = async () => {
      input.addEventListener('input', () => {
        updatePreview();
        updateSnippetWarnings();
      });

      run.addEventListener('click', () => {
        runBenchmark();
      });

      // Generate a persistent url with the current snippets as a url param.
      copyLink.addEventListener('click', async () => {
        const copyUrl = new URL(window.location.href);
        const compressed = await compress(input.value);
        copyUrl.searchParams.set('snippets', compressed);
        navigator.clipboard.writeText(copyUrl.toString());
      });

      // If set, use the `snippets` url parameter for snippets. Otherwise, use a
      // set of predefined examples.
      const currentURL = new URL(window.location.href);
      const currentSnippets = currentURL.searchParams.get('snippets');
      if (currentSnippets) {
        input.value = await decompress(currentSnippets);
      } else {
        input.value = examples.trim();
      }

      updatePreview();
      updateSnippetWarnings();
      checkCrossOriginIsolated();
    }

    function updatePreview() {
      preview.innerHTML = '<h2>Preview</h2>';

      for (const snippet of getSnippets()) {
        let previewTitle = document.createElement('h4');
        previewTitle.textContent = snippet.name;
        preview.appendChild(previewTitle);

        // Modify the snippet html to simulate how the benchmark runner uses
        // unique ids to prevent caching (see: `generateUnique()`).
        let uniqueName = snippet.name + '_' + 123456789;
        let snippetHtml = snippet.html.replaceAll(snippet.name, uniqueName);

        // Use an iframe to isolate each snippet preview. For example, this
        // prevents a style tag in one snippet from applying to other snippets.
        let container = document.createElement('iframe');
        container.srcdoc = `<!DOCTYPE html>${snippetHtml}`;
        preview.appendChild(container);
      }
    }

    async function runBenchmark() {
      const snippets = getSnippets();
      let benchmarkContainer = document.getElementById('benchmarkContainer');
      benchmarkContainer.remove();

      let snippetStats = await benchmark(snippets, document.body);

      document.body.replaceChildren(benchmarkContainer);
      results.innerHTML = formatResults(snippetStats);
    }

    // Return an array of `Snippet`s from #input.
    function getSnippets() {
      let snippets = [];
      let scratch = document.createElement('div');
      scratch.innerHTML = input.value;
      for (const div of scratch.querySelectorAll('snippet'))
        snippets.push(new Snippet(div.getAttribute('name'), div.innerHTML));
      return snippets;
    }

    // Shows or hides a warning with `id`.
    function updateWarning(show, id, message) {
      let element = document.getElementById(id);
      if (show) {
        if (!element) {
          element = document.createElement('div');
          element.id = id;
          element.classList.add('warning');
          benchmarkContainer.prepend(element);
        }
        element.innerHTML = `<b>Warning:</b> ${message}`;
      } else if (element) {
        element.remove();
      }
    }

    // Show warnings for snippet issues.
    function updateSnippetWarnings() {
      let showMissingName = false;
      let showMissingIncludeName = false;
      for (const snippet of getSnippets()) {
        if (!snippet.name) {
          showMissingName = true;
        } else if (!snippet.html.includes(snippet.name)) {
          showMissingIncludeName = true;
        }
      }
      updateWarning(showMissingName, 'missing-name-warning', `Missing
        <code>name</code> attribute on &lt;snippet>.`);
      updateWarning(showMissingIncludeName, 'missing-include-name-warning', `To
        prevent caching, &lt;snippet> contents must contain the snippet name.`);
    }

    // If the page is not loaded with cross-origin isolation headers, timer
    // precision (performance.now(), etc.) is much worse. Below is a comparison
    // with vs without isolation:
    //   Chromium: 5us vs 100us
    //   WebKit: 20us vs 1000us
    //   Gecko: 100us vs 1000us
    function checkCrossOriginIsolated() {
      updateWarning(!self.crossOriginIsolated, 'isolated-warning', `Timer
        precision is reduced because this page is not
        <a href="https://mdn.io/crossOriginIsolated">cross-origin isolated</a>.
        Fix by using <code>python3 server.py</code>.`);
    }

    function formatResults(snippetStats) {
      function formatNumber(num) { return parseFloat(num.toFixed(2)); }
      let resultsHtml = `<h2>Results</h2>
        <table>
          <tr>
            <th rowspan="2">Snippet Name</th>
            <th colspan="2">Total Time (ms)</th>
            <th colspan="2">Parse Time (ms)</th>
            <th colspan="2">Style Time (ms)</th>
            <th colspan="2">Layout Time (ms)</th>
            <th colspan="2">Paint Time (ms)</th>
          </tr>
          <tr>
            <th>Avg</th>
            <th>Std Dev</th>
            <th>Avg</th>
            <th>Std Dev</th>
            <th>Avg</th>
            <th>Std Dev</th>
            <th>Avg</th>
            <th>Std Dev</th>
            <th>Avg</th>
            <th>Std Dev</th>
          </tr>`;
      for (const stats of snippetStats) {
        resultsHtml += `<tr>
          <td>${stats.name}</td>
          <td>${formatNumber(stats.totalAvg)}</td>
          <td>${formatNumber(stats.totalStdDev)}</td>
          <td>${formatNumber(stats.parseAvg)}</td>
          <td>${formatNumber(stats.parseStdDev)}</td>
          <td>${formatNumber(stats.styleAvg)}</td>
          <td>${formatNumber(stats.styleStdDev)}</td>
          <td>${formatNumber(stats.layoutAvg)}</td>
          <td>${formatNumber(stats.layoutStdDev)}</td>
          <td>${formatNumber(stats.paintAvg)}</td>
          <td>${formatNumber(stats.paintStdDev)}</td>
        </tr>`;
      }
      resultsHtml += `</table>`;
      return resultsHtml;
    }

    const examples = `
<snippet name="svg-image">
  <style>
    .svg-image {
      width: 24px;
      height: 24px;
      background-image: url('data:image/svg+xml,<svg uinqueid="svg-image" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M16.59 8.59L12 13.17 7.41 8.59 6 10l6 6 6-6z"></path></svg>');
    }
  </style>
  <div class="svg-image"></div>
</snippet>

<snippet name="inline-svg">
  <style>
    .inline-svg {
      width: 24px;
      height: 24px;
    }
  </style>
  <svg class="inline-svg" viewBox="0 0 24 24">
    <path d="M16.59 8.59L12 13.17 7.41 8.59 6 10l6 6 6-6z"></path>
  </svg>
</snippet>

<snippet name="css-clip-path">
  <style>
    .css-clip-path {
      clip-path: path('M16.59 8.59L12 13.17 7.41 8.59 6 10l6 6 6-6z');
      width: 24px;
      height: 24px;
      background-color: black;
    }
  </style>
  <div class="css-clip-path"></div>
</snippet>`;
  </script>
</body>
</html>