Whether the CSS source mapping can be configured in the document supplement

[hjyyang]

Clear and concise description of the problem

As a developer using Vite, I would like to configure CSS source mapping to enhance the CSS development experience in the development environment, but there is no documentation to do so

Suggested solution

If CSS source mapping is not currently supported or is supported, you want to document this

Alternative

No response

Additional context

No response

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.

[bluwy]

Work on CSS sourcemap is tracked at #2830. Some improvements has been done at #7173