I think you are right for particular cases, but CSS, HTML, and Javascript are all feasible to create test suites for. Either in the form of unit tests, or in t

I think you are right for particular cases, but CSS, HTML, and Javascript are all feasible to create test suites for. Either in the form of unit tests, or in the form of written test cases. From this input the expected output looks like this. And, unlike the spec itself, these example cases can grow over time to be more complete. A partial test suite is still better than no test suite. I am all for pragmatism and if a particular domain being spec'd doesn't lend itself to a particular method of validation, then don't do it, be there are plenty of specs that could benefit that don't have them.