Chapter 4
The Three Most Important Web Form Elements: fieldset, Text Inputs, and Labels
Section 4
<fieldset> - Attributes
Let's turn our attention now to some <fieldset> attributes - disabled and form. If the disabled attribute is present (it is a Boolean attribute), it means that all form controls that are descendants of the <fieldset>, are disabled. Even more, those fields are not editable and won'tt be submitted along with the <form>. The form attribute takes the value of the id attribute of a <form> element you want the <fieldset> to be part of, even if it is not inside the form. The usage of this is confusing - if you want the <input> elements inside the <fieldset> to be associated with the form, you need to use the form attribute directly on those elements.