The Unicode standard ensures that the appropriate codepoints represent, in this case, a cat. Each implementer has full creative freedom in interpreting that as they wish. For some developers, this inconsistency isn't desirable. What they have done instead is re-create the emojis in SVG or PNG form so that they can ensure consistency. An example of someone who does that is Twitter! We used their emoji picker screenshot to start this tutorial off at the beginning, and every emoji you see there isn't from our operating system or platform. It is from the really awesome Twemoji project. There are many emoji libraries out there that you can use, so use whichever one you like if the native emoji support isn't what you are looking for.