HTML5表单的安全性如何？

Question

<input id="user_lic" type="number" min="5" max="30" step="5" value ="5"/>

Would someone be able to disable this min="5" statement and then submit the input with a negative value.

Or for example bypass the type=number statement and enter a symbol

Answer 1

Yes, any HTML can be modified with a basic page inspector. You'll need to include server-side validation to make sure they're not messing with your page.

Answer 2

You should use server side validation. In addition, I would always use POST for your form, and include client-side javascript validation.