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HTML/CSS validation is a key part of professional frontend development. (Everyone can write invalid code. There’s nothing to it.) Without a validation routine, a frontend developer is a bit like the boxer who doesn’t have a routine on the heavy bag. And it shows.
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(I’m still torn on the GIF. A boxer working out seemed a bit too serious, yet now it looks as if a professional frontend developer habitually deploying invalid div soups was as cute as little humanoids trying to handle heavy bags. Nonono that’s not it.)