Web app manifest does not meet the installability requirements
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Installability is a core requirement of Progressive Web Apps (PWAs).
By prompting users to install your PWA, you allow them to add it to their home screens.
Users who add apps to home screens engage with those apps more frequently.
A web app manifest includes key pieces of information
required to make your app installable.
How the Lighthouse web app manifest audit fails
Lighthouse
flags pages that don't have a web app manifest
that meets minimum requirements for installability:
If a page's manifest doesn't include the following properties,
it will fail the audit:
Make sure your app has a manifest that meets the criteria above.
See Make it installable for more information
about creating a PWA.
How to check that your PWA is installable
In Chrome
When your app meets the minimum requirements for installability,
Chrome fires a beforeinstallprompt event
that you can use to prompt the user to install your PWA.
In other browsers
Other browsers have different criteria for installation
and for triggering the beforeinstallprompt event.
Check their respective sites for full details: