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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

:host-context()

The :host-context() CSS pseudo-class function selects the shadow host of the shadow DOM containing the CSS it is used inside (so you can select a custom element from inside its shadow DOM) — but only if the selector given as the function's parameter matches the shadow host's ancestor(s) in the place it sits inside the DOM hierarchy.
:host-context() css reference