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German agencies really really like this obscure CMS called TYPO3. It's not very good. The "developer experience" leads to burnout. The inflexible template engine makes building websites that pass all accessibility criteria practically impossible. Don't use TYPO3.
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Another sample: there's this handy HTML attribute "autocomplete" for form inputs. Guess what CMS doesn't support standard HTML attributes… thankfully browsers do a lot of magic to infer form autofilling, even if the CMS spits out gibberish.