And yet something as basic as a preview is missing. Reddit's community-driven browser plugin ([0]) at least adds that, HN's counterpart [1] sorely needs it.
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Come to think of it, is there a definitive guide to HN comment formatting? Implementing a preview feature in [1] would be doable if the markup is documented.
[0]: https://redditenhancementsuite.com/
[1]: https://chrome.google.com/webstore/detail/hacker-news-enhanc...