All multimedia files should have synchronized captions. Text equivalents for multimedia content must be synchronized with the presentation, i.e. captions must be included. Developers are encouraged to include transcripts of audio and visual content which permit searching and extracting.
Method:
Use “alt” attribute in OBJECT or APPLET tag. OBJECT tag is the preferred method.
<OBJECT classid="java:Press.class" width="500" height="500">
As temperature increases, the molecules in the balloon...
</OBJECT>
