On Oct 29, 2009, at 11:36 AM, Chris Blouch wrote:

> The content of a web browser is internally represented as a tree of  
> objects known as the document object model. For example, a section  
> of the page might have an unordered list and that list would have  
> list items and in a list item would be some text and links and a  
> link might have the URL it's going to jump to. In Jaws and DOM mode  
> for VO you pretty much traverse that tree from top to bottom. The  
> problem is that with CSS (Cascading style sheets) the developer can  
> take parts of that tree and shift where it appears on the page. So a  
> three column layout might have the content from the left column  
> first, then the right column and then the middle column. So if you  
> are navigating the DOM and want to get to the middle column you  
> might have to wade through all the other stuff first. In Group mode  
> the navigation is more geographic. You move around from location to  
> location as it is displayed in the browser. So in the three column  
> example, you might navigate partway down the left column and if you  
> hit VO-right you end up in the middle column partway down. It can  
> get a bit tricky since the nearest object to the right might really  
> by up and to the right a bit so it can jump over things at times. I  
> find Group mode much easier for tables in Safari since I can just go  
> up and down the columns rather than having to VO-right through every  
> element of every row, but for some things DOM mode is better because  
> I have less problems accidentally skipping over something. Which one  
> is to be your favorite is a philosophical and usability choice only  
> you can make.

Ok, thanx for this explanation.  Now, next question is, how does one  
switch between group and DOM mode in VO?  I'm learning more and more  
about using VO, as I've had to increase my magnification with zoom to  
20 the other day.

Egun On, Lagunak! (Basque for G'day, Mates)
Pete Nalda
http://www.myspace.com/musikonalda




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