Dear Mr Yahoo!,
I use a web browser that is only a few years old, but doesn't support any modern standards (when I say "modern" I mean 6+ years old). Please go out of your way to not use any web standards that have been around for nearly a decade just to accomodate my browser's failure to comply with these standards (and ensuring that your site looks uncompetitive with your rivals on browsers that do comply with "modern" standards).
Thank you.