HTML CSS js debug

Hello, Campers,
why would a client need a developer to debug HTML CSS JavaScript errors on his website if there were websites like HTML validator or Javascript validator?

and many thanks in advance

So many reasons:

They didn’t validate
The validator error came back confused
Someone else played in the code
punctuation is easy to miss
You’re the poor SOB who is given a legacy project that needs fixing
Browsers update and longer support a thing
Boss chose cheap and fast over quality
It worked fine in your browser of choice but all your customers use another browser and they report a ton of errors

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