JavaScript Browser support for readyState interactive?

I'm building a web app that has to work on very old browsers (IE 8, Firefox 20, etc).

Can I rely on document.readyState being interactive and complete working correctly?

Basically, I want to perform some action after the DOM loads, but perform the action immediately if it has already loaded. Like this:

if (document.readyState == 'interactive' ||
    document.readyState == 'complete') {
  doAction();
} else {
  document.onready = doAction;
}
Answer:1

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