micromark.js: unquoted: is `completeAttributeValueUnquoted`s case for `completeAttributeNameAfter` missing a `/`?. I’ve added it here.
micromark.js: `]` case in cdata_end does not need to consume, it can defer to `cdata_close`, which should save 1 line
micromark.js: should `tagOpenAttributeValueUnquoted` also support a slash?
micromark.js: `atLineEnding` in html (text) should always eat arbitrary whitespace? code (indented) has no effect on html (text)?

```rs
// ---------------------
// Useful helper:

let mut index = 0;
let mut balance = 0;
println!("before: {:?}", events.len());
while index < events.len() {
    let event = &events[index];
    if event.event_type == EventType::Exit {
        balance -= 1;
    }
    let prefix = String::from_utf8(vec![b' '; balance * 2]).unwrap();
    println!(
        "ev:  {}{:?}:{:?} ({:?}): {:?}",
        prefix,
        event.kind,
        event.name,
        index,
        event.link,
   );
    if event.event_type == EventType::Enter {
        balance += 1;
    }
    index += 1;
}
```