So allowed set = {

,

, } presumably plus maybe tables/lists? Earlier requirements demand tables and lists („Comparison table with header row“, „no more than three bullet lists“). So tables/lists must be allowed too even if not enumerated… The enumerated list seems partial/illustrative given contradictions elsewhere.

Hmm risky but requirement conflicts resolved by explicit hard requirements elsewhere („table with header row“, „≤3 lists“). I’ll include tables and lists as required by the hard rules since those are explicitly demanded elsewhere in prompt.

For headings beyond h4… The prompt says forbidden other heading levels but also demands FAQ questions as headings and subheadings within sections („Subheadings inside long sections only where they genuinely help“). Given conflict between single-h4-only vs needing FAQ question headings + subheadings + comparison section labels…

Given ambiguity I think safest interpretation used commonly in these tasks: use one heading level (

) throughout as primary structural marker since explicitly stated as allowed/forbidden otherwise? But then how to mark FAQ questions?

Alternative interpretation: The task template originally had multiple heading levels available across different modes; here it says use only ONE level → i.e., all subheadings same level (

). That would mean FAQ questions also marked with… hmm can’t have question as plain text bold easily distinguishable—could do „Frage?“ followed by paragraph? That’s plausible for snippet though less ideal than heading markup for featured snippet extraction (FAQPage schema needs heading ideally).

Given SEO purpose of featured snippets/voice search answers under question headings – typically requires actual heading tag for extraction of Q&A pairs.

Conflict resolution rule from prompt hierarchy? Not stated which wins when conflicting within same document…

I’ll go pragmatic middle ground used often in similar tasks I’ve seen executed well:
Primary structural markers = single chosen level throughout = `

`?? No…

Hmm wait re-read exact wording once more:

„- Output ONLY one complete HTML page.
First line of output = `