}
/// Open an HTML tag.
+ ///
+ /// **Note:** HTML attributes have not yet been implemented.
+ /// This function will panic if called with a non-alphabetic `tag_name`.
pub(super) fn open_tag(&mut self, tag_name: &'static str) {
+ assert!(
+ tag_name.chars().all(|c| ('a'..='z').contains(&c)),
+ "tag_name contained non-alphabetic chars: {:?}",
+ tag_name
+ );
self.queued_tags.push(tag_name);
}