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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

:user-invalid (:-moz-ui-invalid)

The :user-invalid CSS pseudo-class represents any validated form element whose value isn't valid based on their validation constraints, after the user has interacted with it.
:user-invalid css reference