Line Numbers + Line Highlight Not Working

Hi @thienduc0105, thank you for the review.

For the line numbers, one thing you can try is switching to the default WP theme (temporarily) and then try again. That will tell you if the issue is theme related.

I’m having the exact same issue. When I reverted to the 2021 theme it made no difference. See https://tribify.me/populate-a-spinner-from-google-forms/

Uh ok you have to add the line-numbers class to the Gutenberg block if you actually want to SHOW the line numbers. I added it to all my body tags with this PHP:

// Add body classes.
function tribify_body_class($classes) {
  $classes[] = 'line-numbers';
  return $classes;
}
add_filter('body_class', 'tribify_body_class');

Nice tip, @tribify. Will see about adding to a future update. Thank you for sharing.