[Karunamon]

On most sites, at least. There are a few out there that go well out of their way to be annoying. Facebook likes to construct their ad text out of multiple randomly-named divs. TVTropes uses randomized IDs on their ad popover.

[boring_twenties]

They seem to do this for more than just straight ads. I use uBlock Origin to filter out the "Stories" div. It comes back every week or two.