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The mobileOK Checker re-uses logos and styles from the W3C Markup validation service. That's good, but the server that runs the W3C Markup validation service is usually slow. Some icons may take 15s to retrieve! The UI should rather be standalone so that it may be deployed easily on different servers and is not impacted by the performances of an external server.
I re-factored the the CSS stylesheet used by the checker, because there were many styles that originated from ancient times and affected newer styles in unpredictable ways from time to time. All images moved to an images subfolder.