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<label>

The HTML Label Element (<label>) represents a caption for an item in a user interface. It can be associated with a control either by placing the control element inside the <label> element, or by using the for attribute. Such a control is called the labeled control of the label element. One input can be associated with multiple labels.
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<legend>

The HTML <legend> Element (or HTML Legend Field Element) represents a caption for the content of its parent <fieldset>.
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<optgroup>

In a Web form, the HTML <optgroup> element  creates a grouping of options within a <select> element.
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<option>

In a Web form, the HTML <option> element is used to create a control representing an item within a <select>, an <optgroup> or a <datalist> HTML5 element.
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<select>

The HTML select (<select>) element represents a control that presents a menu of options. The options within the menu are represented by <option> elements, which can be grouped by <optgroup> elements. Options can be pre-selected for the user.
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<textarea>

The HTML <textarea> element represents a multi-line plain-text editing control.
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<button>

The HTML <button> Element represents a clickable button.
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<fieldset>

The HTML <fieldset> element is used to group several controls as well as labels (<label>) within a web form.
Element Forms HTML HTML forms Intermediate Reference Web

<form>

The HTML <form> element represents a document section that contains interactive controls to submit information to a web server.
Element Forms HTML HTML forms Intermediate Reference Web

Using FormData Objects

The FormData object lets you compile a set of key/value pairs to send using XMLHttpRequest. It is primarily intended for use in sending form data, but can be used independently from forms in order to transmit keyed data. The transmitted data is in the same format that the form's submit() method would use to send the data if the form's encoding type were set to multipart/form-data.
AJAX Blob File FormData Forms XHR XMLHttpRequest

HTMLLabelElement.htmlFor

The HTMLLabelElement.htmlFor property reflects the value of the for content property. That means that this script-accessible property is used to set and read the value of the content property for, which is the ID of the label's associated control element.
Forms HTML DOM htmlFor HTMLLabelElement Reference

HTMLSelectElement.autofocus

The HTMLSelectElement.autofocus property is a Boolean that reflects the autofocus HTML attribute, which indicates whether the associated <select> element  will get input focus when the page loads, unless the user overrides it.
API HTML forms HTMLSelectElement Property Reference

<meter>

The HTML <meter> Element represents either a scalar value within a known range or a fractional value.
Element HTML HTML forms HTML5 Reference Web

<progress>

The HTML <progress> Element is used to view the completion progress of a task. While the specifics of how it's displayed is left up to the browser developer, it's typically displayed as a progress bar. Javascript can be used to manipulate the value of progress bar.
Element HTML HTML forms HTML5 Reference Web

<input>

The HTML element <input> is used to create interactive controls for web-based forms in order to accept data from the user. How an <input> works varies considerably depending on the value of its type attribute.
Element Forms HTML HTML forms HTML input tag MakeBrowserAgnostic NeedsBrowserCompatibility NeedsMobileBrowserCompatibility Reference Web

HTMLLabelElement.control

The read-only HTMLLabelElement.control property returns a reference to the control (in the form of an object of type HTMLElement or one of its derivatives) with which the <label> element is associated, or null if the label isn't associated with a control.
control Forms HTML DOM HTMLLabelElement Property Read-only Reference

HTMLLabelElement.form

The read-only HTMLLabelElement.form property returns an HTMLFormElement object which represents the form of which the label's associated control is a part, or null if there is either no associated control, or if that control isn't in a form.
form Forms HTML DOM HTMLLabelElement Property Read-only Reference

HTMLOptGroupElement

The HTMLOptGroupElement interface provides special properties and methods (beyond the regular HTMLElement object interface they also have available to them by inheritance) for manipulating the layout and presentation of <optgroup> elements.
API Forms HTML DOM Interface NeedsBrowserCompatibility NeedsNewLayout Reference Référence

HTMLSelectElement.selectedIndex

The HTMLSelectElement.selectedIndex is a long that reflects the index of the first selected <option> element. The value -1 indicates that no element is selected.
API HTML DOM HTML forms HTMLSelectElement NeedsBrowserCompatibility NeedsMobileBrowserCompatibility Property Reference

ValidityState

The ValidityState interface represents the validity states that an element can be in, with respect to constraint validation. Together, they help explain why an element's value fails to validate, if it's not valid.
API Constraint Validation API Forms HTML DOM Interface