How to use pageColors?

[arun-mani-j]

The RenderParameters object has a property called pageColors with description as:

Overwrites background and foreground colors with user defined ones in order to improve readability in high contrast mode.

Is there any example on how to use it? It's type is plain object. So what properties should this object have and of what type?

I tried using const pageColors = { foreground: "rgb(100,100,100,255)", background: "rgb(200,200,100,100)" } but the page still renders same as original.

Thank you!