-[Legend Properties](#legends)

-[Title Properties](#title)

-[Scale Range Properties](#scale-range)

-[Signals](#signals)

{: .column-list }

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Configuration files may also contain signal definitions for the top-level scope of a Vega specification. The syntax is identical to[standard signal definitions](../signals/): an array of named signal objects. Adding signal definitions to a configuration can be useful for defining style variables (colors, font sizes, etc.) that may be used elsewhere within either the config or a spec itself. Signals directly defined within a specification itself take precedence over those defined in the configuration.

To enable dynamic scaling of font sizes, one can define a signal that for a font size scale factor, then define other config entries relative to this value:

{

"signals": [

{"name":"fontSizeScale","value":1}

],

"text": {

"fontSize": {"signal":"11 * fontSizeScale"}

}

}

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