How to wait until an element exists?

Question

I\'m working on an Extension in Chrome, and I\'m wondering: what\'s the best way to find out when an element comes into existence? Using plain javascript, with an interval t

Answer 1

A cleaner example using MutationObserver:

new MutationObserver( mutation => {
    if (!mutation.addedNodes) return
    mutation.addedNodes.forEach( node => {
        // do stuff with node
    })
})