https://html.spec.whatwg.org/multipage/dom.html#kinds-of-content
- Node
- Flow content (a, abbr, address, area (if it is a descendant of a map element), article, aside, audio, b, bdi, bdo, blockquote, br, button, canvas, cite, code, data, datalist, del, details, dfn, dialog, div, dl, em, embed, fieldset, figure, footer, form, h1, h2, h3, h4, h5, h6, header, hgroup, hr, i, iframe, img, input, ins, kbd, label, link (if it is allowed in the body), main (if it is a hierarchically correct main element), map, mark, MathML math, menu, meta (if the itemprop attribute is present), meter, nav, noscript, object, ol, output, p, picture, pre, progress, q, ruby, s, samp, script, section, select, slot, small, span, strong, sub, sup, SVG svg, table, template, textarea, time, u, ul, var, video, wbr, autonomous custom elements, text)
- Sectioning (article, aside, nav, section)
- Heading (h1, h2, h3, h4, h5, h6, hgroup)
- Phrasing (a, abbr, area (if it is a descendant of a map element), audio, b, bdi, bdo, br, bu