<button>The <button> element is an interactive element activated by a user with a mouse, keyboard, finger, voice command, or other assistive technology. Once activated, it then performs an action, such as submitting a form or opening a dialog.
<fieldset>The <fieldset> element is used to group several controls as well as labels within a form.
<form>The <form> element represents a document section containing interactive controls for submitting information.
<input>The <input> element is used to create interactive controls for web-based forms in order to accept data from the user.
<label>The <label> element represents a caption for an item in a user interface.
<legend>The <legend> element represents a caption for the content of its parent <fieldset>.
<optgroup>The <optgroup> HTML element creates a grouping of options within a <select> element.
<option>The <option> element is used to define an item contained in a <select>, an <optgroup>, or a <datalist> element.
<select>The <select> element represents a control that provides a menu of options.
<textarea>The <textarea> element represents a multi-line plain-text editing control.
<datalist>The <datalist> element contains a set of <option> elements that represent the permissible or recommended options available to choose from within other controls.
<meter>The <meter> element represents either a scalar value within a known range or a fractional value.
<output>The <output> element is a container element into which a site or app can inject the results of a calculation or the outcome of a user action.
<progress>The <progress> element displays an indicator showing the completion progress of a task, typically displayed as a progress bar.
<keygen>The <keygen> element was dropped in 2015. This element was used to specify a key pair generator field used for forms. When the form is submitted, the private key is stored locally, and the public key is sent to the server.