What does this symbol means in javscript >>>= [duplicate]

I was going through a program solution “Finding Binary Gap” on different sites and I came across a symbol that I’ve never scene before in Javascript i.e ‘>>>=’.

I tried to understand but counldn’t.

  for(var curr=0; n !== 0; n>>>=1) { 
  if(n % 2 === 0) { 
      curr++; 
  } else { 
      curr = 0; 
  } 
  maxZeros = Math.max(maxZeros, curr);
} 

This was the code snippet.
Any idea, comment or reply is appreciated. Thank you.