html tags in rebol are very derp. it's basically just another block but uses <> instead of []. i'm not sure how they handle opening and closing tags over there but it doesn't understand open and close tags unless you specifically check for them.
i put in checks so it understands </...> and <.../> but otherwise it doesn't understand true html so <blobcat meow=loud/> is technically a block [blobcat meow=loud] but that's how rebol do