Indicates whether a text box accepts multiple lines of input or only a single line.

The default behavior of the Enter key depends on whether you type it into a single-line < input type=text> element (submit the form) or a multi-line < textarea> element (insert a new line). You can apply these same default behaviors to the textbox role by using the aria-multiline attribute.

Note: In most user agent implementations, the default behavior of the Enter or Return key is different between the single-line and multi-line text fields in HTML. When user has focus in a single-line element, the keystroke usually submits the form. When user has focus in a multi-line  element, the keystroke inserts a line break. The WAI-ARIA textbox role differentiates these types of boxes with the aria-multiline attribute, so authors are advised to be aware of this distinction when designing the field.

Syntax

<element aria-multiline="true|false" ... />