source/misc/web/shell.html

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<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Block Attack - Rise of the Blocks</title>
  <style>
    html, body {
      margin: 0;
      width: 100%;
      height: 100%;
      overflow: hidden;
      background: #000;
      color: #ddd;
      font-family: sans-serif;
    }
    /* The canvas fills the viewport. SDL's Emscripten backend adopts an
       externally sized canvas as the window size and reports every browser
       resize as a window resize, which the game letterboxes itself. */
    #canvas {
      display: block;
      width: 100vw;
      height: 100vh;
      outline: none;
    }
    #status {
      position: fixed;
      left: 0;
      right: 0;
      top: 45%;
      text-align: center;
      font-size: 1.5em;
      pointer-events: none;
    }
    #progress {
      display: block;
      margin: 0.5em auto 0;
      width: 40%;
    }
    #hint {
      font-size: 0.6em;
      margin-top: 1em;
    }
  </style>
</head>
<body>
  <div id="status">Loading...<progress id="progress" value="0" max="100" hidden></progress><div id="hint">Sound starts after the first click on the game.</div></div>
  <canvas id="canvas" tabindex="-1" oncontextmenu="event.preventDefault()"></canvas>
  <script>
    var statusElement = document.getElementById('status');
    var progressElement = document.getElementById('progress');
    var Module = {
      canvas: document.getElementById('canvas'),
      print: function(text) { console.log(text); },
      printErr: function(text) { console.error(text); },
      setStatus: function(text) {
        // Emscripten reports downloads as "Downloading data... (loaded/total)".
        var match = text.match(/([^(]+)\((\d+(\.\d+)?)\/(\d+)\)/);
        if (match) {
          progressElement.value = parseInt(match[2]) * 100 / parseInt(match[4]);
          progressElement.hidden = false;
          statusElement.firstChild.textContent = match[1].trim();
        } else {
          statusElement.firstChild.textContent = text;
          progressElement.hidden = true;
        }
        statusElement.hidden = text.length == 0;
      },
      onRuntimeInitialized: function() { statusElement.hidden = true; }
    };
    Module.canvas.addEventListener('webglcontextlost', function(event) {
      alert('WebGL context lost. Reload the page.');
      event.preventDefault();
    }, false);
    window.onerror = function(message) {
      Module.setStatus('Error: ' + message);
    };
  </script>
  {{{ SCRIPT }}}
</body>
</html>