This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
fileName property contains the path to the file that raised this error.
This non-standard property contains the path to the file that raised this error. If called from a debugger context, the Firefox Developer Tools for example, "debugger eval code" is returned.
var e = new Error('Could not parse input'); throw e; // e.fileName could look like "file:///C:/example.html"
Not part of any specification. Non-standard.