Dynamic favicon depending on a browser tab focus

Let’s decorate a web page with a favicon that changes depending on the tab focus. When a user opens a page, the tab shows a sample favicon. When the user switches to another tab, the favicon changes. In my illustration the two favicons differ only in colors. When the tab has focus, its favicon is red. When the tab looses focus, the favicon gets white.

Below I describe the three ways to implement dynamic favicons. You can see the…

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