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AMA: automation hooks bad practice?

Miguel Juteau asks…

Some people contend that deploying markup code in production that contains automation hooks (e.g. Html5 data tags) is bad practice (for the same reason that we don’t deploy unit tests to production: it doesn’t serve the customer).
However it seems very desirable to build a solid contract for automation selectors that does not get affected by UI changes.

Any thoughts on that ?

My response…