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html-to-svg

スター12

フォーク1

更新日2026年6月23日 03:06

Turn a report into a portable SVG by authoring a structured/graphical HTML layout and rendering it to SVG with satoru-render. Use when the user asks to compile, summarize, or visualize a report, or wants graphical output that stays viewable in environments that cannot render HTML (chat, PDF viewers, image-only tools, git diffs). Proactively offer SVG output whenever you produce a report that benefits from layout, charts, tables, or styling.

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ushironoko

ushironoko/dotfiles

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html-to-svg

Author a report as HTML (structure + graphics, your judgment), then render it to a single self-contained SVG with satoru-render. The SVG embeds every glyph as a vector path, so the result is portable: it renders identically anywhere an SVG can be shown, with no font or HTML engine required to view it.

When to use

The user asks to "compile / summarize / write up a report" and the content benefits from layout: cards, KPIs, tables, bar/progress charts, timelines, sections.
The user wants a graphic that survives environments without an HTML renderer.
Proactively: when you are about to output a structured report, offer to also produce an SVG version. Confirm before doing extra work if the user only asked for text.

Do not use it for plain prose, code, or anything that reads fine as Markdown.

Prerequisite

satoru-render (a WASM HTML→SVG/PNG/PDF engine, no browser/Puppeteer) must be on PATH. Install once, pinned:

bun install -g satoru-render@1.0.13

Check with which satoru-render; install it if missing. It is npm-distributed, so per project convention it is installed with bun install -g, not mise/ubi.

Workflow

Author the HTML. Design a structured, graphical layout for the report content. Use inline <style> and CSS-only graphics (flexbox/grid, bars, tables). Follow the design format in references/design-format.md — structure-first and low-chroma: structure, hierarchy, and reading flow carry the meaning, not color (no saturated primaries; no color-only labels). references/html-authoring.md has a render-verified template that already implements it — start from that template.
- Omit <!DOCTYPE html> — start at <html> (see the gotcha below).
- Set font-family: 'IBM Plex Sans JP', sans-serif; (the standard font for this format; covers Latin + Japanese) — satoru fetches it from Google Fonts at render time. Write the HTML to a temp file, e.g. $TMPDIR/report.html.
Render to SVG. Output extension .svg selects the format automatically:
```
satoru-render "$TMPDIR/report.html" -o report.svg -w 760 --no-jsdom
```
- -w sets width; omit -h so height auto-fits the content.
- --no-jsdom is correct for static HTML (faster, no extra dependency).
Verify. Confirm the SVG was written and is non-trivial. If the report contains non-ASCII text, check the glyphs actually rendered — see the network caveat below.
Deliver. Surface the file with SendUserFile. Offer to clean up the temp HTML.

Critical caveat: fonts are fetched over the network at render time

satoru resolves non-system fonts (including the format's IBM Plex Sans JP) from Google Fonts during conversion. Claude Code's default Bash sandbox blocks those hosts, so Japanese and other web-font text silently disappears from the output (structure renders, text is blank) while the command still exits 0.

When the report has non-ASCII or web-font text, run the conversion with network egress to fonts.googleapis.com and fonts.gstatic.com (and cdn.jsdelivr.net if you use emoji) — i.e. run the satoru-render Bash call with the sandbox disabled. If glyphs are missing, this is almost always the cause. Details and the local-font workaround are in references/satoru-render.md.

References

references/design-format.md — the default design format: the seven rules (whitespace, structure, plain language, no color-coded labels, low-chroma palette, paragraph writing in ordered sections, gloss every symbolic label), the palette ramps, typography scale, and the patterns that follow them.
references/satoru-render.md — full CLI/API reference, all flags, the font/network requirement, the DOCTYPE gotcha, and other output formats.
references/html-authoring.md — a render-verified report HTML template (implementing the design format) and authoring guidance (CSS-only charts, Japanese fonts, layout patterns).

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name

html-to-svg

description

html-to-svg

When to use

The user asks to "compile / summarize / write up a report" and the content benefits from layout: cards, KPIs, tables, bar/progress charts, timelines, sections.
The user wants a graphic that survives environments without an HTML renderer.
Proactively: when you are about to output a structured report, offer to also produce an SVG version. Confirm before doing extra work if the user only asked for text.

Do not use it for plain prose, code, or anything that reads fine as Markdown.

Prerequisite

satoru-render (a WASM HTML→SVG/PNG/PDF engine, no browser/Puppeteer) must be on PATH. Install once, pinned:

bun install -g satoru-render@1.0.13

Check with which satoru-render; install it if missing. It is npm-distributed, so per project convention it is installed with bun install -g, not mise/ubi.

Workflow

Author the HTML. Design a structured, graphical layout for the report content. Use inline <style> and CSS-only graphics (flexbox/grid, bars, tables). Follow the design format in references/design-format.md — structure-first and low-chroma: structure, hierarchy, and reading flow carry the meaning, not color (no saturated primaries; no color-only labels). references/html-authoring.md has a render-verified template that already implements it — start from that template.
- Omit <!DOCTYPE html> — start at <html> (see the gotcha below).
- Set font-family: 'IBM Plex Sans JP', sans-serif; (the standard font for this format; covers Latin + Japanese) — satoru fetches it from Google Fonts at render time. Write the HTML to a temp file, e.g. $TMPDIR/report.html.
Render to SVG. Output extension .svg selects the format automatically:
```
satoru-render "$TMPDIR/report.html" -o report.svg -w 760 --no-jsdom
```
- -w sets width; omit -h so height auto-fits the content.
- --no-jsdom is correct for static HTML (faster, no extra dependency).
Verify. Confirm the SVG was written and is non-trivial. If the report contains non-ASCII text, check the glyphs actually rendered — see the network caveat below.
Deliver. Surface the file with SendUserFile. Offer to clean up the temp HTML.

Critical caveat: fonts are fetched over the network at render time

References

references/design-format.md — the default design format: the seven rules (whitespace, structure, plain language, no color-coded labels, low-chroma palette, paragraph writing in ordered sections, gloss every symbolic label), the palette ramps, typography scale, and the patterns that follow them.
references/satoru-render.md — full CLI/API reference, all flags, the font/network requirement, the DOCTYPE gotcha, and other output formats.
references/html-authoring.md — a render-verified report HTML template (implementing the design format) and authoring guidance (CSS-only charts, Japanese fonts, layout patterns).