Navigator: buildID property
Non-standard: This feature is not standardized. We do not recommend using non-standard features in production, as they have limited browser support, and may change or be removed. However, they can be a suitable alternative in specific cases where no standard option exists.
Returns the build identifier of the browser. In modern browsers this property now returns a fixed timestamp as a privacy measure, e.g., 20181001000000 in Firefox 64 onwards.
Value
A string representing the build identifier of the application. The build ID is in the form YYYYMMDDHHMMSS.
Examples
js
console.log(navigator.buildID);
Specifications
Not part of any public standard.