I've often said "no." And that's with my primary skillset revolving around HTML and CSS.
The thing that kind of changed my mind though, was the idea that really HTML and CSS are programming languages that utilize very high abstraction through the browser's API. So in reality, we're doing a lot of programming, just via this very specific interface.
At this point, I don't remember where I first read that take on it, but it changed my mind.
Either way, the question feels like gatekeeping. I think you're a "Real" developer if your languages of choice are HTML and CSS even if they're not "real" programming languages. Either way, you provide code that makes something happen.
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