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For example, you don't want to process a form that's missing critical information.When users enter values into an HTML form, the values that they enter are strings.You might also have certain restrictions on the values.
Users get immediate feedback, which is convenient for them.
Client-based validation can also reduce the number of times that the user has to submit the form to correct multiple errors.
In some situations, displaying an error message can cause the page to reflow and can cause elements on the page to move around.
The CSS rules that end in to both have the same fixed size.
It's important to understand that the markup for the error display is always rendered, even if there are no errors.
For example, if a page has an element as a placeholder for an individual field error, even if there is no error.
Note Even if you use client-side validation, validation is always also performed in server code.
Performing validation in server code is a security measure, in case users bypass client-based validation.
A disadvantage of this approach is that users don't know that they've made an error until after they submit the page.
If a form is long or complex, reporting errors only after the page is submitted can be inconvenient to the user.