You lost me with this one. News sites, magazine sites and print publications that use AP style don’t use title caps/case. It’s always in sentence case. I feel like this is going to confuse people who use AP style. Just glance at AP’s news site, CNN, Washington Post, etc. It’s all in sentence caps. All the ones for “AP” style are going to confuse those who are trying to learn AP style. The book, the online manual, the websites all use sentence cap. They never do the title caps. I think you should consider this Title Converter instead.