Although there are undoubtedly at least some bugs in the implementation of client-side JavaScript in Internet Explorer 3.0, Microsoft has not made a list of bugs available to the public. Or rather, it made such a list briefly available on its web site and then withdrew it.
Despite this questionable tactic of Microsoft's, the truth is that the issue of bugs in Internet Explorer 3.0 is usually overshadowed by the issue of compatibilitiy with Navigator 3.0. Any bugs can simply be considered yet another incompatibility to watch out for. See Appendix D, JavaScript Incompatibilities in Internet Explorer 3.0, for details.