For those of you on the bleeding edge, namely on the Firefox 3.1a1pre nightly builds, the Friday’s nightly build will include one big new feature in accessibility for 3.1: Text attributes and spell checking support!
This means that assistive technologies now have access to the attributes of any text run on a page via the IAccessibleHyperText::getAttributes or ATK/AT-SPI equivalent API calls.
For example, running today’s nightly build of Firefox 3.1a1pre on Windows, visiting my blog’s main page, bringing up Accessibility Probe, and navigating to the link below the Heading Level 1 that says “Marco’s Accessibility blog”, a call to IAccessibleHyperText::GetAttributes on the link accessible will get you this result:
getAttributes(1) = NULL
Not very fancy, huh?
Tomorrow’s build, however, will yield a completely different result:
getAttributes(1) = org.eclipse.actf.accservice.core.win32.ia2.IA2TextSegment[text=font-style:normal;language:en-US;text-align:center;font-size:40px;background-color:transparent;font-weight:bold;text-indent:0px;color:rgb(255, 255, 255);font-family:'Trebuchet MS','Lucida Grande',Verdana,Arial,Sans-Serif;text-underline-style:underlinesolid;,start=0,end=26]
So, not only do you get information about the font-family, style, color and backgroundcolor, you also get the language this text is in, the underline style, the font-weight etc.
Also when editing, and you misspell something, as soon as you hit spacebar and the red underline appears, the attributes of that word will change and will include “invalid:misspelling;”, indicating that this word is invalid in that it is misspelled. Of course, an according IA2/ATK event will be fired accordingly! Note that the denotation of this may change if the IAccessible2 and ATK groups decide on a different notation for misspellings. Right now, it follows the aria-invalid convention, and we hope that this will be accepted by the groups.
Over the next few weeks, we’ll fine-tune this feature to be a bit more performant and also iron out any last details that might come up.
But if you’re an assistive technology vendor and you’ve been waiting for us to finally expose these text attributes, now is the time to try them out and provide feedback.
Note that Thunderbird and other projects that will be moving to use the Gecko 1.9.1 platform will also get this feature. This means that inline spell checking notification can also be supported for those apps soon!
[Update]: This patch made it into Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1a1pre) Gecko/2008071803 Minefield/3.1a1pre just fine. So go take a peek!