The detour around flash for accessibility
Yahoo! Tech’s home page features a flash-based media space that highlights stories, comparisons, buying guides, blog posts, and more. Making this accessible required a bit of trial and error, but the solution was simple and can be used by sites everywhere.
Step 1. Inserting the flash object
Window Mode Transparency conflict
However, we had an issue with the flash movie conflicting with a DHTML drop down menu. The flash movie wanted to have the highest z-index and thus sat on top of the menu. To cure this problem, we added the attribute wmode:transparent. This tells the flash movie: your window mode is transparent, you are not the boss, go sit in the back and let others take center stage.
This cured the overlapping issues but negated the accessibility features that we had hoped for. User testing with a screen reader was disheartening. Screen readers ignore flash movies with window mode transparent. They want to do what’s best for the user and ignore the little guy in the back corner.
We began searching for answers on the flash and accessibility forums and couldn’t find a way to get screen readers to read a flash movie with wmode:transparent. It simply isn’t possible at this time.
Step 2. Time for a detour
The U.F.O. enabled page features a div with default text. This is where we originally duplicated the content being fed via xml to the flash movie. Our hope was that the screen readers would ignore the flash and read the HTML content in this div. When this wasn’t possible, we literally thought outside the box.
The U.F.O. script uses
visibility:hidden to hide the default box. We tried using text-indent and negative margins instead, but it still was not available to the screen reader.
The default div now has your standard non-optimized warning text: “For the best experience, please enable JavasScript and download the latest version of Flash….”
We then created a new div (id=”alternatecontent”) that features the content from the flash movie. It is pushed off screen by using absolute positioning. This hides the duplicated content from the visual design while providing the content to those without the visual abilities.
We’re satisfying two audiences with just a little extra code. Add the extra div for your screen reader audience (…and search engines!) when using wmode:transparent in your Flash movie. You’ll create valid, visually dynamic, and accessible pages.