Accessibility
If a page uses the Application Cache, SeoChecker will notify it.
<html manifest="example.appcache"> ... </html>
Therefore you should delete this manifest and substitute it with the Cache API through a service worker.
For the migration you could use sw-appcache-behavior library.
Learn more about Accessibility
On page SEO performance and page checkup.
Over 300 parameters for the deeper page analysis.
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