I just installed Lightbox Plus, hoping to use its inline HTML lightbox to add transcript popups to pages that play videos. Mostly it works, but when I try to use heading tags (H1 through H6) in the text block, they are just displayed as plain body text, with no changes to font/weight/size. Other basic HTML elements (p, ul, ol, strong, em) display as expected, and I can use the style="" attribute within a tag to apply CSS styles, as long as I stay away from shorthand declarations. Any suggestions on how to get headings to use the proper styles?
Demo page: http://sproulplaza.wpengine.com/hello-world/