The value of the visual element that the accessibility node represents.
The node's value can be used to provide dynamic feedback about the node's content or input, such as the text
within a text field, the position of a slider, or the progress of a task.
Set this property only for nodes whose content cannot be fully conveyed by their label. For example, the
label of a node that represents a slider might be "Volume", but its value is "50%", which indicates the
current volume level. In this case, users need to know not just the slider's identity but also its current
value. Conversely, for a node representing a Save button, the label alone provides all the necessary
information, and setting a value would be redundant and confusing.
If the value is set, the screen reader announces it when the user focuses on the node, before or after
reading the node's label (depending on the platform).
To ensure users receive accurate and up-to-date information, update this property whenever the state of the
node changes. For example, update the value of a node representing a text field whenever the user enters new
text.
Notes
- On macOS, this property has no effect on nodes with the following roles:
- AccessibilityRole.Toggle
- AccessibilityRole.TabButton
- On Windows, this property has effect only on nodes with the following roles:
- AccessibilityRole.Button
- AccessibilityRole.Image
- AccessibilityRole.SearchField
- AccessibilityRole.Slider
- AccessibilityRole.TextField
- AccessibilityRole.Dropdown
- AccessibilityRole.ScrollView
- On Windows, nodes with the role AccessibilityRole.ScrollView must have a value containing a
number between 0 and 100 to accurately communicate the scroll percentage to the screen reader. For scroll
views that support both vertical and horizontal scrolling, the value must contain two numbers, with the
vertical scroll percentage listed first. For example, a value of 50, 75 indicates that the scroll view
represented by the node is scrolled 50% vertically and 75% horizontally.