HTML Guide for banner

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>