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HTML is the content layer. CSS is the presentation layer.
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Yes, this is the exact harmful idea that I was talking about. If this were true than there would be no 'reader mode' in browser. Or the reader mode would not modify the html at all.

What you see in reader mode is the content layer. HTML is a part of the presentation layer.

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Are you arguing that things like headers and navbars (which reader mode hides) are part of the presentation layer, not the content layer?
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There are different types of separation of concerns :) https://x.com/simonswiss/status/1664736786671869952
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