Contenteditable post function in js

Job is simple. If you go to facebook, when you post something, they use "contenteditble" to allow user input to be made. Then when hashtag (#) is added, it behaves in a certain way (please look into it to show me that you understand the project). The job is to make a similar or duplicate of this feature using contenteditable (post and hashtag). There will be more jobs after this project Use jsfiddle to send me the link.