Mobile12 rules onwhat changes when your page is served to a phone.
What smartphone crawlers receive compared with desktop crawlers, the viewport and legacy plugins.
Smartphone crawler
- Mobile and desktop get different robots rulesStable robots directives differ between smartphone Chrome and desktop Chrome, excluding noindex.In the report: Pages serve different robots directives to mobile and desktop
- Pages ask to stay out of search only on mobileThe smartphone Chrome response contains noindex while the desktop Chrome response does not.In the report: Pages serve noindex only to the smartphone crawler
- Pages fail for smartphone ChromeSmartphone Chrome repeatedly receives a 4xx, 5xx or redirect loop while desktop Chrome receives 200 HTML.In the report: Pages fail for the smartphone crawler but return 200 on desktop
- Pages that change by device do not say soPages serve different HTML to mobile and desktop without a Vary: User-Agent header.In the report: Dynamically served pages lack the Vary: User-Agent header
- The mobile version drops structured dataStructured-data types in stable desktop HTML are absent from stable smartphone HTML.In the report: Pages omit structured-data types in the mobile-served version
- The mobile version has less or different contentServer HTML contains substantially less or different main content for smartphone Chrome than for desktop Chrome.In the report: Pages serve materially less content to the smartphone crawler
- The mobile version drops or changes headingsThe H1 to H3 headings served to phones, both Googlebot Smartphone and a phone browser, lack headings the desktop version has.In the report: Pages drop or change headings in the mobile-served version
- The mobile version has a different title or descriptionThe title or meta description served to both Googlebot Smartphone and a phone browser differs from the desktop one.In the report: Pages serve a different title or meta description to the smartphone crawler
- The mobile version leaves out internal links found on desktopDistinct internal link targets in stable desktop HTML are missing from the smartphone HTML.In the report: Pages expose fewer internal links to the smartphone crawler
Viewport and plugins
- A page has no viewport tagA page's HTML has no viewport meta element, or its first one is empty.In the report: Viewport meta missing
- Viewport settings restrict zoomThe captured head declares user-scalable=no or a maximum-scale below 5; device behaviour is not measured.In the report: Pages disable pinch-zoom in their viewport meta tag
- A page embeds legacy plugin contentThe page embeds object, embed or applet content that needs Flash, Java or Silverlight.In the report: Pages embed plugin content no browser supports