HTML Validation

The “main” role is unnecessary for element “main”.

About This HTML Issue

The main landmark role is used to indicate the primary content of a document. It can be added to an element by using role="main", but instead it’s preferable to just use the <main> element. In that case, it’s unnecessary to make the main role explicit. Examples:

<div role="main">
<!-- this is a valid way to define a main role -->

</div>

<main>
<!-- but this is shorter and uses correct semantic HTML  -->

</main>

Learn more:

→ HTML Spec: the main element
→ MDN: ARIA Main Role

Last reviewed: October 27, 2022

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Reading time

1 min read

Category

HTML Validation

Engine

W3C Validator

Last reviewed

October 27, 2022

Resources

Related W3C Validator Issues

A document must not include more than one visible “main” element.

There can only be one visible <main> element in a document. If more are needed (for example for switching between them with JavaScript), only one can be visible, the others should be hidden toggling the hidden attribute.

Example of 2 main elements, where only one is visible:

<main>
  <h1>Active main element</h1>
<!-- content -->

</main>

<main hidden>
  <h1>Hidden main element</h1>
<!-- content -->

</main>

The “main” element must not appear as a descendant of the “article” element.

main
article

A main element cannot be placed inside an article element according to HTML5 content model rules.

The main element is intended to identify the dominant content of the <body> that is directly related to, or expands upon, the central topic of a document. It is meant to be unique, appearing only once per document, and must not be a descendant of elements like article, aside, header, footer, or nav. Conversely, the article element represents a self-contained composition that could independently be reused or distributed, such as a blog post or news story.

To resolve the error, move the main element so that it is a direct child of the body, and place any article elements inside the main or at the same level, not the other way around.

Incorrect:

<article>
  <main>
    <h1>Article Title</h1>
    <p>This is the article content.</p>
  </main>
</article>

Correct:

<main>
  <article>
    <h1>Article Title</h1>
    <p>This is the article content.</p>
  </article>
</main>

Minimal valid HTML document:

<!DOCTYPE html>
<html lang="en">
<head>
  <title>Article in Main Example</title>
</head>
<body>
  <main>
    <article>
      <h1>Article Title</h1>
      <p>This is the article content.</p>
    </article>
  </main>
</body>
</html>

Use only one main element per page and ensure it is not nested inside sectioning elements such as article.

The “main” element must not appear as a descendant of the “section” element.

main
section

The “main” element must not appear as a descendant of the “main” element.

main

A main element cannot be nested within another main element.

The main element represents the primary content of a document or application, and there must be only one per page, not placed inside another main. The main element must not be used as a descendant of another main element. This is important for accessibility, semantic correctness, and helps screen readers correctly identify the main content region.

Invalid example (nested main):

<main>
  <h1>Welcome</h1>
  <main>
    <p>This nested main element is invalid.</p>
  </main>
</main>

Valid example (single main only):

<main>
  <h1>Welcome</h1>
  <section>
    <p>This section is valid and can be placed inside main.</p>
  </section>
</main>

If you need to divide the main content, use sectioning elements like section, article, or div inside a single main element, but never nest main inside main.

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