title: Where I get navigator.connection each effective type throughput or downlink information
body: <p>I am trying to find the network speed by using the new API , which is in experimental technology</p>
  
  <p><a href="https://developer.mozilla.org/en-US/docs/Web/API/NetworkInformation/effectiveType" rel="nofollow noreferrer">https://developer.mozilla.org/en-US/docs/Web/API/NetworkInformation/effectiveType</a></p>
  
  <p>this API will support slow2g,2g,3g,4g connection types for now.</p>
  
  <p>Also I have written a fallback method if this feature is not supported in browser for finding the network speed.</p>
  
  <p>My question is  I need to know what would be the default throughput of this default APIs connection types . is there any documentation to get the details? So I can emulate based on this in fallback code.</p>