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HTML5 Form Attributes (Part 1)
The following is an extract from our book, HTML5 & CSS3 for the Real World, 2nd Edition, written by Alexis Goldstein, Louis Lazaris, and Estelle Weyl. Copies are sold in stores worldwide, or you can buy it in ebook form here.
required attribute tells the browser to only submit the form if the field in question is filled out. Obviously, this means that the field can’t be left empty, but it also means that, depending on other attributes or the field’s type, only certain types of values will be accepted. Later in the chapter, we’ll be covering different ways of letting browsers know what kind of data is expected in a form.