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.
This event, as many others on this page, is dispatched to "trusted" targets only; for example, it is not dispatched to the content of the main browser object in Firefox, even if it comes from a chrome:/ URI.
Same as above, but also fired for enclosed frames.
window.addEventListener("DOMFrameContentLoaded", myeventhandler, true);