From http://www.w3schools.com (Copyright Refsnes Data)
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 ).
| Value | Description |
|---|---|
| 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 |
From http://www.w3schools.com (Copyright Refsnes Data)