deterministic as that when you apply class names to your templates you get deterministic resolution eg:
class="red green" makes your element green
class="green red" makes your element red
i.e. there is no cascade anymore but classes are applied in the order they're used.
DSS is pretty much like CSS, the only constraint is that it must be compilable to atomic CSS classes so there are a few restrictions https://dss-lang.com/supported-css-features/
Can you show a side by side example showing the difference between plain old CSS Style Sheets and deterministic Style Sheets