What requirements should be given to the designer to get the right website design for ultra-clear displays (Retina Display)?

Question

Design

We need an adaptive website design for ultra-clear displays (Retina Display).
What requirements should be given to the designer to get the right website design for ultra-clear displays (Retina Display)?
All raster graphics (including pictures) are for high resolution displays.
Vector graphics can be converted to SVG.
Factor @3x, i.e. with a resolution of 489 pixels / inch?
All right?

Answer 1

Submit this article: A Designer's Guide to DPI

Answer 2

This is what I read!
And what should be indicated in the statement of work?

Answer 3

The designer needs to set the requirement "Make for the retina (or including for the retina)", and then he must figure it out himself, this is his headache and his profession - to know such things.