Customization - Do you use the built-in test form events before you publish JavaScript changes?
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Generally you will add Javascript to the form to give client side validation.
Given JavaScript is difficult to debug and doesn't get precompiled this can save a lot of time rather than re-publishing all the form changes and having to reload and refresh the forms manually. These events can be trigged using the Preview menu from the form customization environment.
Figure: Test your Javascript via the Preview menu in the Custom Forms Designer