How I can make sure that emojis look the same on every device?

I'm using the default iOS emojis on my website and would like that all users see those emojis.

Something like this:

Use small images instead of emojis. Only way

I think it works with by replacing emojis by small images using javascript. WordPress does this, so you might be able to use whatever they use.

Just be careful because for example Apple emojis must only be used on Apple devices, you can't use them everywhere. Check that yourself too, please.

The twitter emojis are a good alternative: