favicon.missing

What to change

A finding of this rule on a page carries the exact edits for that page: the markup it quotes, and what to write instead.

When it runs

Runs on every SEO audit: of a page, a crawl, a build directory or HTML. Info is a best practice: worth doing, rarely urgent, and --no-info leaves it out. Each finding takes 1 point off the page's score.

The severity here is the rule's usual one: a finding can be raised or lowered when the page gives a reason.

Run it, or skip it

Check a page for this rule alone, after a fix for instance:

npx @rivi-software/agentic-seo-check audit https://example.com --rule favicon.missing

Or from an assistant, with the MCP tool seo_audit_page:

{
  "url": "https://example.com",
  "rules": [
    "favicon.missing"
  ]
}

To leave it out of an audit, pass --disable favicon.missing on the command, or disableRules: ["favicon.missing"] to a tool.

• Infoviewport.not-scalableThe viewport disables user zoom (user-scalable=no or maximum-scale=1).
• Infocharset.missingNo character encoding is declared, in the HTML or in the Content-Type header.
• Infodoctype.missingThe document does not start with <!DOCTYPE html>.
• Infodocument.html-too-largeThe HTML document is larger than 1.5 MB.
• Errorhead.closed-earlyAn element that does not belong in <head> (an <img>, <iframe>, <div>, stray text) ends it early, so search engines read the metadata after it as part of <body> and ignore it.
• Warninghead.metadata-in-bodyMetadata that search engines read only in <head> (title, meta description, viewport, canonical, hreflang) is written in <body> (warning). Metadata a framework streams into a hidden part of <body> and moves into <head> with JavaScript, as Next.js does for an async generateMetadata, is info. Robots meta tags are not reported: Google honours them in <body> too.
• Infocharset.lateThe character encoding is declared after the first 1024 bytes, where the HTML spec requires it, and the Content-Type header does not declare it.
• Warninghttps.mixed-contentAn https page loads resources over http. Browsers block scripts, stylesheets, frames and responsive images (warning) and upgrade plain images, audio and video to https, which fails when the https URL does not exist (info). With a Content-Security-Policy of upgrade-insecure-requests, every resource is upgraded (info).