The speak-header property is used only in Aural Stylesheets.
The aural rendering of a document combines sounds and voices to go through the content of a document. Aural presentation occurs often by converting the document to plain text and then feeding this to a screen reader.
Situations and markets for listening to information could be:
The speak-header property specifies whether table headers will be spoken before each cell OR spoken only once (before the series of cells associated with the header ).
|once||Default. The table header will be spoken once (before the series of cells associated with the header )|
|always||The table header will be spoken before each cell|