Fired on a Window object when a document's DOM content is finished loaded, but unlike "load", does not wait till all images are loaded. Used for example by GreaseMonkey to sneak in to alter pages before they are displayed.
Does not appear to be dispatched to a Browser object (why?)
Same as above, but also fired for enclosed frames.
window.addEventListener("DOMFrameContentLoaded", myeventhandler, true);