Einstein, merged build (two sources, preserved verbatim)

No editing of Einstein or your comments was performed. Each original HTML file is embedded exactly as provided, rendered via iframe srcdoc.

Merged (stacked) view Both originals shown in sequence, each in its own frame
Open A full Open B full
Source A, h3.html (verbatim) Copy A HTML
Source B, i1.html (verbatim) Copy B HTML

If you want a single continuous DOM merge (not frames), say so and I’ll do it, but this version guarantees zero accidental edits to the original markup and comments.