placeholder

textarea - A hint to the user of what can be entered in the control. Carriage returns or line-feeds within the placeholder text must be treated as line breaks when rendering the hint. input - A hint to the user of what can be entered in the control . The placeholder text must not contain carriage returns or line-feeds. 

<strong>Note:</strong> Do not use the <code>placeholder</code> attribute instead of a <a title="The HTML <label> element represents a caption for an item in a user interface." href="/en-US/docs/Web/HTML/Element/label"><code><label></code></a> element, their purposes are different. The <a title="The HTML <label> element represents a caption for an item in a user interface." href="/en-US/docs/Web/HTML/Element/label"><code><label></code></a> attribute describes the role of the form element (i.e. it indicates what kind of information is expected), and the <code>placeholder</code> attribute is a hint about the format that the content should take. There are cases in which the <code>placeholder</code> attribute is never displayed to the user, so the form must be understandable without it.