Besides intrusion, good things are also possible with client side scripting. Client side scripting means that the browser runs the script. However, due to a lot of abuse of this form of scripting there are visitors who have this option disabled. So make sure that most functionality and preferable all is available to those visitors. Also there are quite some differences between browsers regarding what is supported and how. Quite often visitors are treated on error box after error box asking them if they want to debug the page. This can't be what is intended. So test and test. Some useful scripting applications are discussed below.
Read the rest of Client side scripting.
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