2.1.1179 Part 4 Section 4.6.9, audio (Audio)
For additional notes that apply to this portion of the standard, please see the notes for tnLst, §4.6.87(b) .
a. The standard allows the isNarration attribute to be set to true on any audio element.
The isNarration attribute can only be true if the <audio> element contains a child <cMediaNode> (“[ECMA-376] Part 4 §4.6.29; cMediaNode (Common Media Node Properties)”) with a child <tgtEl> (“[ECMA-376] Part 4 §4.6.81; tgtEl (Target Element)”) that contains a <spTgt> element (“[ECMA-376] Part 4 §4.6.72; spTgt (Shape Target)”) that points to a valid sound shape. A valid sound shape is a shape that includes as a child of the <nvPr> element (“[ECMA-376] Part 4 §184.108.40.206; nvPr (Non-Visual Properties)”) one of the following elements: <wavAudioFile> (“[ECMA-376] Part 4 §220.127.116.11; wavAudioFile (Audio from WAV File)”) or <audioFile> (“[ECMA-376] Part 4 §18.104.22.168; audioFile (audio from File)”).