To comments about halting; to actually "compute" in CSS requires "pumping" (clicking or key taps). This is not substantively different than the "pumping" a clock does to our computer chips (they just do it "automatically"). Yes CSS will halt for any given execution cycle between these "pumps"; but comparing that to the halting problem in general means that I can argue our CPUs are not Turing complete because they are guaranteed to complete execution of any single instruction. If CSS is not Turing complete neither is my computer and by extension any programs executing on it.
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CSS can encode Rule 110
Rule 110 is known to be Turing complete
QED: CSS is Turing complete
To comments about halting; to actually "compute" in CSS requires "pumping" (clicking or key taps). This is not substantively different than the "pumping" a clock does to our computer chips (they just do it "automatically"). Yes CSS will halt for any given execution cycle between these "pumps"; but comparing that to the halting problem in general means that I can argue our CPUs are not Turing complete because they are guaranteed to complete execution of any single instruction. If CSS is not Turing complete neither is my computer and by extension any programs executing on it.