Some time ago I managed to crash the browser with recursive async operations. Didn't save the bug, but it could be useful to kill spam bots. Also read in HN tha

Some time ago I managed to crash the browser with recursive async operations. Didn't save the bug, but it could be useful to kill spam bots. Also read in HN that Cloudflare uses or used deeply nested HTML tables to measure browser processing and detect bots. Some PDF's recursive or expensive operations might have this effect. For example PostScript has decompression functions that could be used to inflate huge streams. I'm making a next-gen search engine and will work on these anti-bot measures.