Display P3
Display-P3 is a color space defined by Apple. The color space uses the DCI P3 primaries, a D65 white point, and the sRGB transfer function.
Browser Support
It's supported by browsers based on webkit. When you visit the page and try the examples, you will see if your browser supports the wide gamut. For a quick check, look at this page. The colored squares in the figure on the right hand side should be more saturated.
At MDN is a table that shows the support for this features in different browsers.
Usage
The P3 color space is used in the following pages.