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The Navigator Object

The userAgent property returns the user-agent header sent by the browser to the server:

// detects and displays the user-agent header sent by the browser to the server
document.getElementById("demo").innerHTML =
navigator.userAgent;

Warning

• The information from the navigator object can often be misleading.
• The navigator object should not be used to detect browser versions because:
  • Different browsers can use the same name
  • The navigator data can be changed by the browser owner
  • Some browsers misidentify themselves to bypass site tests
  • Browsers cannot report new operating systems, released later than the browser