First case: When you create a form, inside the form, you create a button, and when the button has clicked.
Second case: Your inside the form or inside the div, button type or input type is submit.
-in this two cases, you use e.preventDefault();
otherwise, you can't see the output. Your output is ready but not show. It display too fast that you can't see it.
- without using e.preventDefault();
- with using e.preventDefault();
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