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Now that Microsoft has effectively won the Browser War (for the moment) there is some rationisation taking place. But standardisation is causing more problems as the process of defining a standard is sidetracked by companies still jockeying for position in the market. The latest major entrant is the Firefox browser available on most Linux installations and also now available on Windows.
Tcl could not be used as a de facto browser scripting language because it is open source and freely available to all computer companies to use - so noone can use it to get an exclusive advantage. Also Tcl is too easy to add new features to - anyone can do it because of Tcl's simple primitves. For instance, to create a new loop construct.