How to be sure you watch HDR10 and Dolby Vision content on iPhone X

[Super Xander]

I’ve bough an iPhone X, and would like to see what video content on this beautiful screen with HDR10 or Dolby Vision enabled.
How can I be sure that what I watch is this?
I know you can buy Dolby Vision movies on iTunes, but I don’t want to pay for them to experience the look for a few minutes, does Dolby Vision movies also shows in Dolby Vision on iTunes trailers, or is this only in the movies when renting or buying?

Also do anyone have a nice place or video, where HDR10 and Dolby Vision can be seen for sure?

 

[iPhone1]

https://9to5mac.com/2017/11/16/vime...layable-on-iphone-x-ipad-pro-and-apple-tv-4k/

 

[1096bimu]

If you can’t see it and has to be told, the why do you care if you’re watching it?

It’s like asking how you know you’re drinking expensive wine, well if you can’t tell, what is the problem with drinking cheap wine?