Which HTML5 Tags Should Only Occur Once in a Document? [closed]

StackOverflow https://stackoverflow.com/questions/21892552

  •  13-10-2022
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Question

This is mainly a question about semantic markup. I believe there are some tags which ought to only occur once in an HTML5 document for that document to be considered semantically correct. I believe <nav> is one such tag. I wonder if <h1> also falls into this category. Are there any others? So far this is the list, maybe someone could flush out the list?

  • <nav>
  • <h1>
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Solution

The only tags that need to be unique on the page are:

  • <html>
  • <head>
    • <title>
  • <body>
    • <main>

The rest can occur as many times as you want, and it'll still be completely valid, even semantically.

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