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I haven’t worked in JS since 1999, so I’m quite rusty. I remember working in it in the past, and I was able to enable some kind of error reporting. Right now, when I have a syntax error in a script, no error is reported in the browser. Is there a directive or something to enable error reporting in a JS file?
Most scripts in the wild are so full of crass errors that browsers don’t bother complain about them any more.
In IE by default the error indicator in the left hand side of the status bar can be used to display the error. Or you can turn error alerts back on from Internet Options -> Advanced -> Browsing -> Display a notification about every script error, but that will make the rest of the internet unusably annoying.
In Firefox, Tools -> Error Console will bring back the familiar JavaScript console.