Description
Identifies the element (or elements) that describes the object. See related aria-labelledby.
The aria-labelledby attribute is similar to the aria-describedby in that both reference other elements to calculate a text alternative, but a label should be concise, where a description is intended to provide more verbose information.
The element or elements referenced by the aria-describedby comprise the entire description. Include ID references to multiple elements if necessary, or enclose a set of elements (e.g., paragraphs) with the element referenced by the ID.
Example
HTML Example 1
<div class="text">
<label for="first">First Name:</label>
<input
type="text"
id="first"
name="first"
onfocus="tooltipShow(tooltip1)"
onblur="tooltipHide(tooltip1)"
onmouseover="tooltipShow(tooltip1)"
onmouseout="tooltipHide(tooltip1)"
aria-describedby="tp1"
/>
<div id="tp1" class="tooltip" role="tooltip">Your first name is optional</div>
</div>
HTML Example 2
<img src="/foo" alt="abbreviated name" aria-describedby="prose1">
<div id="prose1">This prose in this div describes in detail the image foo.</div>