This is often useful, because even with type="number", the value of HTML input elements always returns a string. Unlike most elements in an HTML document, form fields can get keyboard focus. X Axis: Category vs. Value . In HTML Attributes, New. In this case the for and id attributes are not needed because the association is implicit. Optional;Flash, HTML . They can also be associated with a form via the form attribute of the tag. placeholder: string: The short hint displayed in the input before the user enters a value. I guess it would be the most searched trick about basic HTML forms and checkboxes. Let’s see an example of button and , HTML