FAQ: Learn HTML: Form Validation - Requiring an Input

This community-built FAQ covers the “Requiring an Input” exercise from the lesson “Learn HTML: Form Validation”.

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This exercise can be found in the following Codecademy content:

Introduction to HTML

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It’s already filled in for me.

Already filed required attribute

How can I style the text error box that pops up after nothing has been entered in the input box.

what is the use of class atrribute

I don’t know much about HTML 5 but I’m pretty sure it comes into play when you start including Javascript code into a website. Sorry if this answer isn’t very informative, that’s about as far as I know.

See this lesson from CodeCademy: https://www.codecademy.com/courses/learn-css/lessons/css-setup-selectors/exercises/class-name

Hi, I was wondering how I use the required attribute in case I have put in a radio button input, checkbox input, dropdownlist, datalist input etc. Because there are a variety of inputs there.

Thanks in advance.


How do we change the text of the validation message popup?
where did it fetch the popup content from as we didn’t enter it as part of the HTML code.

Does it matter if the “label element” or the “input element” comes first in writing code? Is their a hierarchy? I keep seeing them interchanged in hierarchical structure. But I also see the “
” tag used too between the 2 elements, and I am wandering if that affects where text is displayed in the output if hierarchy does/doesn’t matter between the 2 elements?