# Document preview

## Sidebar tabs

- Default tab: Files
- Files close buttons (alone -> with guide -> restored): 1 -> 1 -> 1
- Manual guide close buttons: 1
- Add buttons (Files -> guide -> Files): 1 -> 0 -> 1

## Markdown

- Heading: Markdown smoke
- Tail loaded by scrolling: Markdown tail
- Viewers: Markdown -> Code -> Plain text
- Same tab: true

## HTML

- Viewer: HTML
- Sandbox: allow-scripts
- Inline script: INLINE_OK
- Local script: LOCAL_JS_OK
- Outside-workspace script: OUTSIDE_JS_OK
- Local stylesheet: rgb(12, 34, 56)
- Parent access: parent-blocked (SecurityError)
- Parent unchanged: true

## PDF

- Viewer: PDF
- Worker: dsh-pdf
- Continuous pages: 2
- Horizontal overflow: false
- Canvas fills: red -> blue -> blue
- Same tab: true

## Code paging

- Viewer: Code
- Initial reading indicator: true
- Lines: 64 -> 65
- Prefix retained: true
- Tail: const tail = "CODE_TAIL";

## Unknown suffix

- Viewer: Plain text
- Text: UNKNOWN_SUFFIX | Plain fallback.