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docs: add note about dev-server startup and styles
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A note has been added to the application builder documentation regarding
the Vite-based development server and style processing that could
potentially result in initial FOUC due to server processing overhead on startup.
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@clydin
clydin committed Nov 19, 2024
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Expand Up @@ -179,6 +179,10 @@ ng serve

You can continue to use the [command line options](/cli/serve) you have used in the past with the development server.

HELPFUL: With the development server, you may see a small Flash of Unstyled Content (FOUC) on startup as the server initializes.
The development server attempts to defer processing of stylesheets until first use to improve rebuild times.
This will not occur in builds outside the development server.

### Hot module replacement

Hot Module Replacement (HMR) is a technique used by development servers to avoid reloading the entire page when only part of an application is changed.
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