How to understand that you are a middle front-end developer?

Question

Career in IT

Greetings!
I work as a junior front-end developer, I have a couple of questions for those who have already gone this way.
I will be very interested to know your opinion. Thank you for every answer

• How to understand that you are already a middle front-end developer?
  
• How is junior different from middle front-end?
  
• What does the middle know that the junior front-end developer does not know?
  
• What is the process of promotion to middle front-end developer in companies?
  
• What is the difference between junior and middle front-end developer responsibilities?
  
• By what criteria are they compared?
  
• A set of skills for a middle front-end developer?
  
• How to become a middle front-end developer?
  

PS It is not necessary to answer absolutely all questions)
But it will be cool if it works)

Answer 1

"We will call you senior tomato, just don't ask for a raise in salary"
If you can prove to the manager (the one who directly affects your salary) that you are worthy of paying the middle, you are the middle.

Answer 2

How to understand that you are already a middle front-end developer?

Try to get a middle position, but this is not an indicator.
In the normal realm, that a thought can be trusted to write code without checking it. June needs to be controlled.
They should not differ in knowledge, experience and ability to apply a standard solution, yes.
Then I got tired of answering the same idiotic questions.