A new-member thread showed literal <div> tags inline because the paste came from a mobile rich-text source (Safari contenteditable, Apple Mail, etc.) and leaked block tags into the textarea.
What was happening: the Markdown pipeline runs with raw HTML escaping on for defense-in-depth, so stray <div>, <p>, and <br> got HTML-encoded and surfaced as visible tag text.
Fix: fresh post input now has <div>, </div>, <p>, </p> normalized to paragraph breaks and <br> to a newline before Markdown runs. The escape-and-purify defense stays intact — only the paste artifacts get rewritten. The one affected historical post has been rewritten to clean paragraphs.
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D2sk - Sysop