text sequence of characters that can be programmatically determined , where the sequence is expressing something in human language text alternative Text that is programmatically associated with non-text content or referred to from text that is programmatically associated with non-text content.
      Programmatically associated text is text whose location can be programmatically determined
      from the non-text content. Example An image of a chart is described in text in the paragraph after the chart. The short
      text alternative for the chart indicates that a description follows. Note Refer to Understanding Text Alternatives for more information. up-event platform event that occurs  when the trigger stimulus of a pointer is released The up-event may have different names on different platforms, such as "touchend" or "mouseup".