As of August 16th, 2025, the following HTML tags are allowed on Fluffle:

a, abbr, acronym, align, area, article, aside, audio, b, bdi, bdo, blockquote, br, caption, center, cite, code, col, colgroup, data, dd, del, details, dfn, div, dl, dt, em, figcaption, figure, footer, h1, h2, h3, h4, h5, h6, header, hgroup, hr, i, img, ins, kbd, li, map, mark, markdown, nav, ol, p, pre, q, rp, rt, rtc, ruby, s, samp, small, source, span, strike, strong, style, sub, summary, sup, table, tbody, td, th, thead, time, tr, tt, u, ul, var, video, wbr

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List maintained by CoolCoder

Sources: 1 2