Testing:<p>I tried to use the smiley face emoji &#x27;SMILING FACE WITH OPEN MOUTH&#x27; (U+1F603) on the preceding line. This is non-BMP, so maybe that&#x27;s why it&#x27;s stripped.<p>Testing:<p>Here I tried to use the smiley face emoji &#x27;WHITE SMILING FACE&#x27; (U+263A) on the preceding line. This is BMP, so why is it stripped?<p>Testing: naïveté<p>Hmm, at least HN supports some very basic diacritics.<p>Testing: ありがとう<p>Japanese works? Yet not smiley faces. Odd.