HTML Checking for Large Sites
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<header> element can’t include other
<header> elements inside.
The header element represents a group of introductory or navigational aids, as in this example:
<body> <header> <h1>Welcome to our Shop</h1> <nav> <ul> <li><a href="/toys">Toys</a> <li><a href="/books">Books</a> <li><a href="/shoes">Shoes</a> </ul> </nav> </header> <p>Main content...</p> </body>
Related W3C validator issues
The <header> HTML element represents introductory content, typically a group of introductory or navigational aids, and has an implicit role of banner, so specifying this role is redundant.
The following example represents a banner using the role attribute:
<div role="banner"> <img src="companylogo.svg" alt="my company name" /> <h1>Title</h1> <p>Subtitle</p> </div>
By default, the HTML5 <header> element has an identical meaning to the banner landmark, unless it is a descendant of <aside>, <article>, <main>, <nav>, or <section>, at which point <header> is the heading for that section and not the equivalent of the site-wide banner.
This example uses the <header> element instead of the banner role:
<header> <img src="companylogo.svg" alt="my company name" /> <h1>Title</h1> <p>Subtitle</p> </header>
A <header> section can’t include any <footer> section inside.
The footer element represents a footer for its nearest ancestor sectioning content or sectioning root element. A footer typically contains information about its section such as who wrote it, links to related documents, copyright data, and the like.
Footers don’t necessarily have to appear at the end of a section, though they usually do. In any case, they can’t go nested inside a <header> section.
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