Break each assigned block of the topic "{topic}" into its SUBBLOCKS — the individual learnable sub-points the concept is made of. A later guide will write a short text PER subblock.

Assigned to you — binding: every block must appear, invent no additional ones:
{assignment}

What a subblock is:
- A single sub-point you must learn for the block. One statement, one aspect, one pitfall.
- Examples: block `<img>` → `src` (Bildquelle), `alt` (Alternativtext), empty `alt` for decorative images, `width`/`height` against layout shifts, void element without a closing tag. Block `<p>` → text paragraph as a block, allowed inline children, no nesting.

DECISIVE — the count follows the difficulty:
- A simple, trivial block has FEW subblocks (1–2). Do NOT inflate it.
- A complex, rich block has MANY subblocks. Leave out nothing essential.
- There is NO target count. `<img>` must have noticeably more subblocks than `<p>`.

Rules:
- Each subblock is atomic: exactly one sub-point. No two aspects in one point.
- Only what THIS block yields (scope). Don't inflate anything mentioned only in passing.
- Backed, not invented. Verify uncertain points via web search.
- Subblock titles in GERMAN (code identifiers stay original), max. ~10 words, one statement.

Write ONLY the file {out_path} — one block marker per block (title EXACTLY from the assignment), with the subblocks as a list below it:

<!-- block: Exact block title -->
- First subblock
- Second subblock

Write the marker line exactly like this. No text outside the blocks.
{known}
{extra}
