# StackDraft compatibility suite

This fixture exercises portable Markdown, converted assets, proactive publishing warnings, and destination-review cases.

## Preserved formatting

### Emphasis, links, and inline code

Use **bold** for a label, *italic* for light emphasis, ~~remove stale text~~, and open the [StackDraft guides](https://www.stackdraft.app/guides). Run `npm run build` before publishing.

### Lists

1. Draft in Markdown
2. Prepare in StackDraft
3. Verify in Substack

- Headings
- Links
- Code

### Blockquote

> A publishing handoff is only complete after the destination preview passes.

---

### Fenced code

```ts
export function canonicalUrl(pathname: string) {
  return new URL(pathname, "https://www.stackdraft.app").toString()
}
```

## Converted assets

### Compact table

| Plan | Price | Best for |
| --- | ---: | --- |
| Free | $0 | New readers |
| Monthly | $8 | Regular readers |

### Mermaid diagram

```mermaid
flowchart LR
  Draft[Markdown draft] --> Check[Publishing checks]
  Check --> Copy[Rich-text copy]
  Copy --> Post[Substack post]
```

## Intentional warnings

### Wide table

| One | Two | Three | Four | Five | Six |
| --- | --- | --- | --- | --- | --- |
| A | B | C | D | E | F |

### Image checks

![Local architecture](./images/architecture.png)

![SVG architecture](https://example.com/architecture.svg)

![](https://example.com/missing-alt.png)

### Raw HTML

<div class="custom-layout">This raw HTML is intentionally included to trigger a portability warning.</div>

## Heading-level check

#### This H4 intentionally skips H3

## Long code check

```text
line 01
line 02
line 03
line 04
line 05
line 06
line 07
line 08
line 09
line 10
line 11
line 12
line 13
line 14
line 15
line 16
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line 75
line 76
line 77
line 78
line 79
line 80
line 81
```

## Destination review

### Math

$$\mathrm{CTR} = \frac{clicks}{impressions}$$

### Remote image

![Publishing workflow](https://example.com/workflow.png)