According to Wikipedia prefix for presto is -XV-
-xv-color: #FF0; /* paragraphs in yellow for Presto browsers */
I wanted to know for presto browser the prefix is -O- or -XV-. Is Wikipedia wrong??
In the Opera documentation about HTML and XHTML, we document the support of -xv-.
XHTML+Voice Profile (X+V)
Opera Presto fully supports the XHTML+Voice profile (and the Mobile Profile subset).
- The support of X+V includes support of CSS3 Speech (with an
-xv-prefix as this module is under preparation).- X+V needs to be served as an XML media type (
application/xml,application/xhtml+xml,application/x-xhtml+voice+xml) for XML Events to take effect.- For more information see the X+V developer documentation.
On Opera Web Developer documentation, you will find a few articles explaining xv extension.