Date: 07/26/07 (Java Web)    Keywords: browser, java, microsoft

You would be surprised to know that the biggest Internet Explorer issue I am facing while writing rather complex cross-browser javascript code is related to just a comma. In javascript array if you add a comma after the last element in the array then Internet Explorer fails with a variety of undecipherable (Microsoft style) error messages. [...]

Source: http://blog.taragana.com/index.php/archive/biggest-internet-explorer-problem-with-javascript/