@Wolf480pl @Shamar @tuxcrafting @izaya HTML can already do both probably. There was that 1 gajillion by 1 gajillion PNG bug a few years ago.
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Actually, when I was young, I did something like that by mistake: an error page had a frame (can't recall why) but under some conditions it erroneously loaded itself as the frame target.
I have no idea if it would still be an issue 20 years later.
If I remember correctly, #Firefox has a maximum depth of 9 iframe.
@Wolf480pl@niu.moe @tuxcrafting @izaya
