`html.favicon`

Default: warn
Plugin: html

A page links to a favicon.

Why: Search results and browser tabs show the favicon next to your page. Without one, they show a generic icon. The rule accepts the rel values that Google supports: icon, shortcut icon, apple-touch-icon, and apple-touch-icon-precomposed.

When off: pages without a favicon pass.

<!-- ✗ Fails -->
<head>
  <title>Home</title>
</head>

<!-- ✓ Passes -->
<head>
  <link rel="icon" href="/favicon.svg" />
</head>

References

Google: Favicon in search results: Google shows a favicon from these rel values. A favicon is optional, so the rule warns.