JS1k: The JavaScript code golfing competition

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/**
       * Thanks to:
       * http://demosthenes.info/blog/943/An-SVG-Analog-Clock-In-6-Lines-of-JavaScript
       * http://onlinetonegenerator.com/binauralbeats.html
       *
       * http://closure-compiler.appspot.com
       * http://siorki.github.io/regPack.html
       * http://www.w3schools.com/
       * http://stackoverflow.com/
       *
       * Variables
       * a - canvas
       * b - body
       * c - audio context
       * d - current date
       * e - event
       * f - exception
       * g - audio channel merger
       * h - hour hand element
       * i - iterator, alarm angle
       * j - window innerWidth
       * k - clock height
       * l - alarm hand
       * m - minute hand element
       * n - second hand element
       * o - audio oscillators, hour hand angle
       * p - period marker
       */

      // Clock face, period marker
      document.write('<svg viewBox="0 0 100 100" style="margin:auto" display=block height=' + (k = Math.min(innerHeight, j = innerWidth)) + 'px stroke=#fff text-anchor=middle stroke-width=.2px font-size=5px font-family=Arial>\
                        <circle stroke-width=.5px cx=50 cy=50 r=45 fill=#333 stroke=#000 />\
                        no inline svg \
                        <text x=50 y=39>c1ocK</text>\
                        <rect x=43 y=60 width=14 height=6 />');

      // Hour markers
      for(i = 13; --i; g = 0)
        document.write('<text fill=#fff stroke=none x=' + (Math.cos(i * Math.PI / 6 ) * 36 + 50) + ' y=' + (Math.sin(i * Math.PI / 6) * 36 + 52) + ' >' + ((i + 2) % 12 + 1) + '</text>\
                        <line x1=50 x2=50 y1=5 y2=10 transform=rotate(' + i * 30 + ',50,50) />');

      // Set up audio elements
      try {
        c = new AudioContext();
        g = c.createChannelMerger(2);

        o = c.createOscillator();
        o.start();
        o.frequency.value = 600;
        o.connect(g, 0, 0);
        o = c.createOscillator();
        o.start();
        o.frequency.value = 720;
        o.connect(g, 0, 1)
      }
      catch(f) {
        // Draw line displaying audio is disabled
        document.write('<line x1=53 x2=56 y1=62 y2=65 />')
      }
 
      // Period marker text, hands
      document.write('  <text fill=#fff stroke=none x=50 y=65 id=p />\
                        <line stroke-width=.4px x1=50 x2=50 y1=50 y2=25 id=l stroke=red />\
                        <line stroke-width=.4px x1=50 x2=50 y1=50 y2=30 id=h />\
                        <line stroke-width=.4px x1=50 x2=50 y1=50 y2=20 id=m />\
                        <line x1=50 x2=50 y1=55 y2=15 id=n />\
                    </svg >');

      // Update function, onclick event
      setInterval(onclick = function(e) {
          // Calculate alarm time
          if (e) {
            i = Math.atan2(k / 2 - e.pageY, j / 2 - e.pageX) / Math.PI * 180 - 90;
          }
          if (i < 0) {
            i += 360;
          }

          // Update hands and period marker
          d = new Date();
          o = d.getHours() % 12 * 30 + d.getMinutes() / 2;
          n.setAttribute('transform', 'rotate(' + 6 * d.getSeconds() + ',50,50)');
          m.setAttribute('transform', 'rotate(' + 6 * d.getMinutes() + ',50,50)');
          h.setAttribute('transform', 'rotate(' + o + ',50,50)');
          l.setAttribute('transform', 'rotate(' + i + ',50,50)');
          p.textContent = 12 > d.getHours() ? 'AM \u266A' : 'PM \u266A';

          // Check alarm, chop train whistle
          if (g) {
            if (1 > Math.abs(i - o) && d.getSeconds() % 2) {
              g.connect(c.destination);
            }
            else {
              g.disconnect();
            }
          }
        },
        30);