access key A single key on the keyboard that, when typed in conjunction with the Alt or Control key, allows users to jump to a spot within a Web page.
add-on A stand-alone program run within Web browsers.
calendar picker A Web form control used to select dates and times from a calendar or clock.
check box A Web form control used to store data values limited to true/false or yes/no responses.
checkbox data type An attribute value used with the input element to create a Web form check box control.
client-side validation A validation process that is performed on users' own computers.
color picker A Web form control used to select colors from an array of color values.
command button A Web form button that runs a command that affects the contents of the Web page or the Web browser itself when clicked.
control element Web form object such as a button, box, or list that provides ways of entering values for specified fields.
data type In JavaScript, the type of information stored in a variable.
date data type An attribute value used with the input element to create a calendar picker.
field An item that stores a piece of information in a form.
field set A grouping of fields within a Web form.
field value The data value of a Web form field.
fieldset element An HTML element that marks a group of control elements and data fields.
focus In a Web form, the state in which an element has been clicked by the user, making it the active control element on the form.
focus pseudo-element A CSS pseudo-element that selects the form control that has the focus of the user's keyboard.
for attribute A Web form label attribute that identifies the id of the Web form control paired with the label.
form button In a Web form, a control element that performs an action.
form element An HTML element that marks a Web form.
get method A method of submitting Web form data to a server by appending it to the end of the URL specified in the action attribute.
inline validation A Web form validation process in which data errors are highlighted as they occur during data entry.
input box A Web form control used for entering text and numeric data.
input element A Web form control used to mark elements in which data can be entered.
invalid pseudo-element A CSS pseudo-element that selects a form control storing an invalid data value.
label element An HTML element that marks a text description for a Web form control.
legend element An HTML element that marks a legend for a Web form field set.
max attribute An attribute that specifies the maximum value of a Web form spin box or range slider.
min attribute An attribute that specifies the minimum value of a Web form spin box or range slider.
multiple attribute In a Web form selection list, an attribute that allows a user to make multiple selections.
number data type An attribute value used with the input element to create a spin box.
option button A Web form control used for selecting a single option from a predefined list of options.
option element An HTML element that marks an option from a selection list.
option text The text associated with a selection list option.
placeholder An attribute that provides a hint about the type of data accepted in a Web form field.
placeholder attribute A Web form control attribute that provides a hint about the type of data accepted in a data field.
post method A method of submitting Web form data to a server by sending it in a separate data stream from the Web page.
radio button. See option button
radio data type An attribute value used with the input element to create a Web form option button control.
range data type An attribute value used with the input element to create a range slider.
regex. See regular expression
regular expression A concise description of a character pattern used in data validation.
required data type A data type for a field in a Web form that indicates that a value is required for the field, and that the form will be rejected without it.
required field A Web form field that requires that a user specify a value before submitting the form.
reset button A Web form button that resets the form, changing all field values to their default values, when clicked.
reset data type An attribute value used with the input element to create a Web form reset button.
select element An HTML element used to create a selection list.
selected attribute An attribute of a selection option used to indicate that the option is selected by default.
selection list A Web form control used for selecting an option value from a long list of options.
server-side validation A validation process that is performed on a Web server.
size attribute An attribute for a Web form selection list that specifies the number of options displayed to users.
slider A Web form control used to select numeric values from a range of possible numbers.
spin box A Web form control used to select a numeric value from a set of possible numbers.
spinner control A Web form control in which users select numeric values by clicking a spin arrow button to increase or decrease the field value.
step attribute An attribute that defines the amount that the value in a spin box increases or decreases with each click of the spin arrow.
submit button A Web form button that submits the form to a server for processing when clicked.
submit data type An attribute value used with the input element to create a Web form submit button.
text area A Web form control used to store extended text entries.
textarea element An element that creates a text area box for multiple lines of text in a Web form.
valid pseudo-element A CSS pseudo-element that selects a form control storing a valid data value.
validation The process by which the field values from a Web form are tested before they can be used.
value attribute A Web form control attribute that provides the default value of a data field.