You read it and if you have anything interesting to say about its content, you write that. Picking apart the implementation details of the site itself just brings the unseriousness to HN which is why the site guidelines ask you not to do that sort of thing.
If someone indulges on a beef steak while talking about something, that would be tangential in most circumstances, except when the talk is about the benefits of veganism. You're creating a strong dissonance between your message and your mode of delivery.
What the guidelines do discourage, however, is commenting on whether the article has been read.
is commenting on whether the article has been read.
They do, which is why I didn't.
One of the ideas expressed in the content is to use HTML tables for styling and aligning content - using grid and flexboxes flies in the face of that suggestion.