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function ready() {
 // do your stuff
}

// this is required for the (not so) edge case where your script is loaded after the document has loaded
// https://developer.mozilla.org/en/docs/Web/API/Document/readyState
if (document.readyState !== 'loading') {
  ready();
} else {
  // the document hasn't finished loading/parsing yet so let's add an event handler
  document.addEventListener('DOMContentLoaded', ready);
}