MutationObserver watches the DOM, specifically the places you tell it to, like:
document.querySelector('#watch-this');
...and it can tell you (trigger a callback) when stuff happens — like when a child is added, removed, changed, or a number of other things.
I used it just the other day to watch the <head> of a Pen and detected newly-injected processed Sass code, so you could use CodePen to see Sass and CSS side by side:
See the Pen
Sassmeister clone by Chris Coyier (@chriscoyier)
on CodePen.
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