Used to reference a form action element, easing target/selection for input types like radio or checkbox.

As wrapper:

<label><input type="checkbox" name="Cats"> I like Cats!</label>

Clicking text toggles input.

As reference (using for):

<input id="cats" type="checkbox" name="Cats"><label for="cats">I like Cats!</label>

for value must match target's ID.

Simple form with labels:

<form action="/login" method="POST"><label for="username">Username:</label><input id="username" type="text" name="username" /></form>

Attribute	Description
`name`	String representing the name of an output. Used for collecting values on form submit.
`for`	Space-separated list of form element IDs whose values the output displays calculations for.
`form`	String representing the ID of the associated form.

The $<output>$ element needs JavaScript to function.
Input values from fields are text, so they must be converted to numbers (e.g., parseInt(), parseFloat(), Number()) for calculations.

HTML elements that do not have a closing tag and do not contain any content.
HTML 4.01/XHTML 1.0 Strict void elements: area, base, br, col, hr, img, input, link, meta, param.
HTML5 additions (non-deprecated): source.

Example with void elements:

<img src="..." /><br><hr><input type="number" placeholder="Enter your favorite number">

It is best practice to have a space before the slash for self-closing tags (e.g., $<img />$).

Attribute	Details
`width`	Sets the element's width in pixels.
`height`	Sets the element's height in pixels.
`<source>`	Defines resources of the audio or video files.
`track`	Defines the text track for media elements.
`controls`	Displays controls.
`autoplay`	Automatically starts playing the media.
`loop`	Plays the media in a repeated cycle.
`muted`	Plays the media without sound.
`poster`	Assigns an image to display until a video is loaded.

<audio controls><source src="file.mp3" type="audio/mpeg">Your browser does not support the audio element.</audio>

Embeds a