Separate Favicon for the Admin Area
Uses a different browser tab icon in wp-admin than on the public site, so admin tabs are easy to spot among the others.
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Stop WordPress Serving Its Logo as favicon.ico
When no Site Icon is set, WordPress answers /favicon.ico with its own logo. This returns a plain 404 instead, so your tab never shows the WordPress logo.
Use the Main Site's Icon on Sites Without One
Makes subsites that have no Site Icon of their own show the main site's favicon and app icon, so every browser tab carries your brand.