what's the difference if i use name attribute and don't use name attribute because i cant see the difference in result or output

Question

here are two codes below. one includes name attribute and other is without name attribute. my question is what's the difference if i use name attribute and don't use name attribute because i cant see the difference in result or output

https://code.sololearn.com/WXUmk0s3l8HW/?ref=app

https://code.sololearn.com/Wt18Ff03pla6/?ref=app

Answer 1

The name is used in form submission (in Document Object Model).
When you submit a form only the fields with a name will be submitted.

So, if you have a php file for processing your form after submission
you should have name attribute defined.

For example, you can access the fields like :
<?php
echo $_GET["username"];
echo $_GET["password"];
?>