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HTML

correct ways to markup a form in HTML5

for example I see some forms with a ID, Name and value? some only Name or ID : input type="text" id="name" name="user_name" (OR) input type="text" name="lastname"

It depends on what you want to do. If you need to call that form field in your CSS or JavaScript you'd give it an ID. But if you didn't, you can leave that off. You will generally want a "name" b/c that's the name of the variable that the field captures and you usually need that for whatever backend receives the data (PHP script for ex). "value" you usually don't need on an input field b/c that gets entered by the user, but sometimes you want to set them up with a default value.

Thanks for the clarification