HTML5forIE

annotated.js

function(a,i){
  a="header0footer0section0aside0nav0article0figure0figcaption0hgroup0time".split(0); // array
  for(i=10;i--;) document.createElement(a[i]) // and element creation
}

index.js

function(a,i){a="header0footer0section0aside0nav0article0figure0figcaption0hgroup0time".split(0);for(i=10;i--;)document.createElement(a[i])}

LICENSE.txt

            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
                    Version 2, December 2004

 Copyright (C) 2011 Matthias Le Brun http://mlb.li

 Everyone is permitted to copy and distribute verbatim or modified
 copies of this license document, and changing it is allowed as long
 as the name is changed.

            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

  0. You just DO WHAT THE FUCK YOU WANT TO.

package.json

{
  "name": "HTML5 for IE",

  "description": "Enables HTML5 elements on Internet Explorer",

  "keywords": [
    "polyfill",
    "ie",
    "shim",
    "html5"
  ]
}

132 bytes:

function h(a){a?document.createElement(a):"header footer section aside nav article figure figcaption hgroup time".replace(/\w+/,h)}

Damn, forgot //g at the end of the regexp:

function h(a){a?document.createElement(a):"header footer section aside nav article figure figcaption hgroup time".replace(/\w+/g,h)}

129 bytes :

;("header footer section aside nav article figure figcaption hgroup time").replace(/\w+/g,function(a){document.createElement(a)})

This may be the shortest version, 126 bytes

"header footer section aside nav article figure figcaption hgroup time".replace(/\w+/g,(var d=document).createElement.bind(d))