Why is <s> not listed as Phrasing Content on MDN?

Question

On the page about Content Categories on MDN, the tags <b> and <i> are listed under both "phrasing content" and "flow content".

The pages for <b> and <i> both list them as phrasing and flow content, whereas the <s> tag lists "Phrasing content or flow content" (emphasis mine). However, there's no note on the Content Categories page that clarifies this, and I cannot find the <s> element in the HTML5 specification, despite MDN not marking it as obsolete or deprecated.

Is this just a mistake on MDN's part, or is the <s> element poorly defined?

Answer 1

Probably a mistake or inconsistency on MDN's part. W3C HTML5 and WHATWG HTML both clearly list the <s> element under §4.5 Text-level semantics as flow content, phrasing content, and palpable content, exactly as they do with the <b> and <i> elements.