https://www.adobe.com/jp/print/postscript/pdfs/PLRM.pdf
How interesting a web would be with embeddable PostScript figures! Yes it's Turing-complete and all, and yes that's no problem: Interpret these figures with a timeout, make the interpretation interruptible, use a sandbox or different threads for rendering etc. HTML+CSS+user interaction is Turing complete as well, and we can still browse the web despite this.
Thank you a lot for PostScript!