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CodePen has released slideVars, a built-in tool for creating interactive demos with adjustable parameters. By importing the library and calling slideVars.init(), it automatically detects CSS variables and generates a control panel. The tool supports manual configuration for input types, value ranges, default values, and CSS numeric units. Variables must be declared on the :root element by default, though custom scoping is possible with manual setup. The control panel can be repositioned using a custom HTML element or CSS styling.

Playing With CodePen slideVars

Shared articles about the most poetic of the code languages.