# Custom Renderers
> Compare renderer policies in @humanspeak/svelte-markdown, rendering the same markdown with defaults and an allow-list via allowRenderersOnly.
**Source:** [https://markdown.svelte.page/examples/custom-renderers](https://markdown.svelte.page/examples/custom-renderers)
**Markdown mirror:** [https://markdown.svelte.page/examples/custom-renderers.md](https://markdown.svelte.page/examples/custom-renderers.md)
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This mirror preserves the prose, implementation notes, and runnable Svelte source behind the live example page.
## FIG-001: default renderers.
No renderer override — every built-in lights up. Headings, paragraphs, lists, code blocks, tables, blockquotes, and horizontal rules all render normally.
**Metadata:** tag: `DEFAULT` | renderers: `all built-ins`
### Notes
- Pass nothing for `renderers` and every built-in lights up — paragraphs, headings, lists, code blocks, tables, blockquotes, rules.
- The right default for content authoring. You get full markdown fidelity with no opt-in needed.
### Source
#### DefaultRenderers.svelte
Source file: [src/lib/examples/custom-renderers/demos/DefaultRenderers.svelte](https://github.com/humanspeak/svelte-markdown/blob/main/docs/src/lib/examples/custom-renderers/demos/DefaultRenderers.svelte)
```svelte
```
## FIG-002: filtered renderers.
allowRenderersOnly whitelists a tight set of formatting renderers. Code blocks, tables, blockquotes, and horizontal rules drop entirely from the same markdown source.
**Metadata:** tag: `FILTERED` | renderers: `allow-list`
### Notes
- `allowRenderersOnly([...])` turns the renderer map into an allow-list. Anything not in the list silently drops out.
- Use to strip features the source supports but you don't want — e.g. no code blocks in chat bubbles, no tables in mobile previews.
### Source
#### FilteredRenderers.svelte
Source file: [src/lib/examples/custom-renderers/demos/FilteredRenderers.svelte](https://github.com/humanspeak/svelte-markdown/blob/main/docs/src/lib/examples/custom-renderers/demos/FilteredRenderers.svelte)
```svelte
```