<label>: The Label element

Associating a <label> with a form control, such as <input> or <textarea> offers some major advantages:

• The label text is not only visually associated with its corresponding text input; it is programmatically associated with it too. This means that, for example, a screen reader will read out the label when the user is focused on the form input, making it easier for an assistive technology user to understand what data should be entered.
• When a user clicks or touches/taps a label, the browser passes the focus to its associated input (the resulting event is also raised for the input). That increased hit area for focusing the input provides an advantage to anyone trying to activate it — including those using a touch-screen device.

To explicitly associate a <label> element with an <input> element, you first need to add the id attribute to the <input> element. Next, you add the for attribute to the <label> element, where the value of for is the same as the id in the <input> element.

Alternatively, you can nest the <input> directly inside the <label>, in which case the for and id attributes are not needed because the association is implicit:

<label>
  Do you like peas?
  <input type="checkbox" name="peas" />
</label>

The form control that a label is labeling is called the labeled control of the label element. Multiple labels can be associated with the same form control:

<label for="username">Enter your username:</label>
<input id="username" name="username" type="text" />
<label for="username">Forgot your username?</label>

Elements that can be associated with a <label> element include <button>, <input> (except for type="hidden"), <meter>, <output>, <progress>, <select> and <textarea>.

This element includes the global attributes.

for

The value of the for attribute must be a single id for a labelable form-related element in the same document as the <label> element. So, any given label element can be associated with only one form control.

Note: To programmatically set the for attribute, use htmlFor.

The first element in the document with an id attribute matching the value of the for attribute is the labeled control for this label element — if the element with that id is actually a labelable element. If it is not a labelable element, then the for attribute has no effect. If there are other elements that also match the id value, later in the document, they are not considered.

Multiple label elements can be given the same value for their for attribute; doing so causes the associated form control (the form control that for value references) to have multiple labels.

Note: A <label> element can have both a for attribute and a contained control element, as long as the for attribute points to the contained control element.

There are no special styling considerations for <label> elements — structurally they are simple inline elements, and so can be styled in much the same way as a <span> or <a> element. You can apply styling to them in any way you want, as long as you don't cause the text to become difficult to read.

Don't place interactive elements such as anchors or buttons inside a label. Doing so makes it difficult for people to activate the form input associated with the label.

Don't do this:

<label for="tac">
  <input id="tac" type="checkbox" name="terms-and-conditions" />
  I agree to the <a href="terms-and-conditions.html">Terms and Conditions</a>
</label>

Prefer this:

<label for="tac">
  <input id="tac" type="checkbox" name="terms-and-conditions" />
  I agree to the Terms and Conditions
</label>
<p>
  <a href="terms-and-conditions.html">Read our Terms and Conditions</a>
</p>

Placing heading elements within a <label> interferes with many kinds of assistive technology, because headings are commonly used as a navigation aid. If the label's text needs to be adjusted visually, use CSS classes applied to the <label> element instead.

If a form, or a section of a form needs a title, use the <legend> element placed within a <fieldset>.

Don't do this:

<label for="your-name">
  <h3>Your name</h3>
  <input id="your-name" name="your-name" type="text" />
</label>

Prefer this:

<label class="large-label" for="your-name">
  Your name
  <input id="your-name" name="your-name" type="text" />
</label>

An <input> element with a type="button" declaration and a valid value attribute does not need a label associated with it. Doing so may actually interfere with how assistive technology parses the button input. The same applies for the <button> element.