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Why did Odeo fail? Lack of Focus
Evan Williams, co-founder of Twitter and Blogger, failed with his first startup, Odeo. What went wrong with Odeo? Williams' first startup was a podcasting company that failed due to a lack of focus. He learned that it's important to stay focused and adapt to changes in the market.
Odeo

:focus-visible

The :focus-visible pseudo-class applies while an element matches the :focus pseudo-class and the UA (User Agent) determines via heuristics that the focus should be made evident on the element. (Many browsers show a "focus ring" by default in this case.)
:focus-visible css reference