How Google uses HTML5 to reduce startup latency for mobile Gmail

  <script id="lazy">
  // Make sure you strip out (or replace) comment blocks in your JavaScript first.
  /*
  JavaScript of lazy module
  */
  </script>

  <script>
  function lazyLoad() {
    var lazyElement = document.getElementById('lazy');
    var lazyElementBody = lazyElement.innerHTML;
    var jsCode = stripOutCommentBlock(lazyElementBody);
    eval(jsCode);
  }
  </script>

var x = "hello /* world */";

I wouldn't do it this way. Instead just bundle all your code into a single file and optimize its caching. No HTML5 needed: use HTTP headers.

The chip on an iPhone runs at what, 600 MHz, maybe 800 MHz? My Apple II ran at 1 MHz. I was counting bytes then. I hope I'll see a day where I don't count bytes anymore :-)

And the title is wrong - they are not using HTML5 to do anything, it's about how to reduce latency by lazy loading modules in the background.