Opera is the first voice-enabled browser that can offer a full, all-round web experience, greatly expanding web access not only to visually or motorically impaired people, but easing access via a mobile phone, on vertical computers, etc.
Opera has been working jointly with IBM on a multimodal browser.
The two main new concepts of voice-enabled Opera are
What is a voice browser? A voice browser is a device that interprets voice markup languages to generate voice output and accepts voice input.
Voice is a very natural and immediate communication channel that can be used either on its own, or joinedly with mouse, keyboard or other devices.
Voice-enabled Opera furthermore allows you to interact with web pages coded in XHTML+Voice (X+V) - you can fill in online forms and otherwise interact with the page. But voice-enabled Opera will allow you also c3n, the new voice interaction with the browser itself. c3n, the command, control and content navigation, can integrate or even fully replace the traditional keyboard or mouse control of the browser interface: navigate the page, browse the web, open links, log into password-protected pages, fetch and read your mail, and many more things will be possible with spoken voice commands.
Opera now is the first all-round graphical and voice browser to include support for CSS3 Speech properties! CSS3 Speech still is a working draft only: in order to avoid possible interference with some properties that possibly might change, Opera has chosen to prefix them with -xv-.
Supported properties are:
For the time being, there is no further official documentation - you can however find more info on CsAnt's opera.vox pages.