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Use when creating or updating favicon files, app icons, or PWA icons for Shisho
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Basierend auf der SOC-Berufsklassifikation
| name | favicon |
| description | Use when creating or updating favicon files, app icons, or PWA icons for Shisho |
Shisho uses a bookshelf icon on a dark rounded square for its favicon. Generate from SVG source by rendering each target size directly with Playwright (transparent background), then bundling the ICO with ImageMagick.
| File | Size | Purpose |
|---|---|---|
favicon.svg | 512x512 viewBox | Vector source, modern browsers |
favicon.ico | 16x16 + 32x32 | Legacy browsers, direct /favicon.ico requests |
favicon-16.png | 16x16 | Small browser tabs |
favicon-32.png | 32x32 | Standard browser tabs |
apple-touch-icon.png | 180x180 | iOS home screen (full-bleed, see below) |
There are no 192/512 PNGs: nothing references them (no PWA manifest). If a manifest is added later, generate them then, and make them full-bleed maskable icons, not pre-rounded.
<svg width="512" height="512" viewBox="0 0 512 512" fill="none" xmlns="http://www.w3.org/2000/svg">
<rect width="512" height="512" rx="32" fill="#171717"/>
<g transform="translate(36, 20) scale(9)">
<rect x="4" y="40" width="40" height="4" rx="1" fill="#c4b5fd"/>
<rect x="8" y="12" width="7" height="28" rx="1" fill="#c4b5fd"/>
<rect x="17" y="8" width="6" height="32" rx="1" fill="#c4b5fd" opacity="0.7"/>
<rect x="25" y="16" width="8" height="24" rx="1" fill="#c4b5fd"/>
<rect x="35" y="10" width="5" height="30" rx="1" fill="#c4b5fd" opacity="0.7"/>
</g>
</svg>
Key values:
#171717 (neutral-900)#c4b5fd (violet-300)rx="32" (subtle, not app-icon style)translate(36, 20) scale(9) centers the 48x48 iconCritical rules (violating these reintroduces the white-corner bug):
favicon-16.png, favicon-32.png, and therefore favicon.ico) MUST have transparent corners. Screenshot with Playwright's omitBackground: true and a transparent page background. A plain screenshot bakes the white page background into the corners, which shows as light fringing on dark browser tab strips.apple-touch-icon.png MUST be a full-bleed opaque square with NO rounded corners (rx="0" variant of the SVG). iOS applies its own corner mask and renders transparency as black; pre-rounded corners leave visible slivers inside the iOS mask.Process:
tmp/, so playwright resolves from the repo's node_modules; all paths below assume cwd = repo root):
import { chromium } from "playwright";
import { readFileSync } from "fs";
const svg = readFileSync("public/favicon.svg", "utf8");
const fullBleed = svg.replace('rx="32"', 'rx="0"');
const targets = [
{ file: "public/favicon-16.png", size: 16, svg, transparent: true },
{ file: "public/favicon-32.png", size: 32, svg, transparent: true },
{ file: "public/apple-touch-icon.png", size: 180, svg: fullBleed, transparent: false },
];
const browser = await chromium.launch();
for (const t of targets) {
const page = await browser.newPage({ viewport: { width: t.size, height: t.size }, deviceScaleFactor: 1 });
const sized = t.svg.replace('width="512" height="512"', `width="${t.size}" height="${t.size}"`);
await page.setContent(`<style>html,body{margin:0;padding:0;background:transparent}svg{display:block}</style>${sized}`);
await page.screenshot({ path: t.file, omitBackground: t.transparent });
await page.close();
}
await browser.close();
magick public/favicon-16.png public/favicon-32.png public/favicon.ico
# Corners of 16/32 PNGs and the ICO frames must be transparent or
# semi-transparent dark (e.g. srgba(21,21,21,0.34) at 32px,
# srgba(23,23,23,0.75) at 16px), never opaque white/gray.
magick public/favicon-32.png -format "alpha: %A, TL: %[pixel:p{0,0}]\n" info:
magick public/favicon-16.png -format "alpha: %A, TL: %[pixel:p{0,0}]\n" info:
magick "public/favicon.ico[0]" -format "alpha: %A, TL: %[pixel:p{0,0}]\n" info:
magick "public/favicon.ico[1]" -format "alpha: %A, TL: %[pixel:p{0,0}]\n" info:
# apple-touch-icon must be opaque #171717 in all four corners (full-bleed).
magick public/apple-touch-icon.png -format "TL: %[pixel:p{0,0}]\n" info:
In index.html:
<link rel="icon" type="image/svg+xml" href="/favicon.svg" />
<link rel="icon" type="image/png" sizes="32x32" href="/favicon-32.png" />
<link rel="icon" type="image/png" sizes="16x16" href="/favicon-16.png" />
<link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png" />
The transform centers a 48x48 icon viewBox in a 512x512 canvas:
To recenter after changing scale, calculate:
40 * scale (icon spans x=4 to x=44)36 * scale (icon spans y=8 to y=44)(512 - content_width) / 2 - (4 * scale)(512 - content_height) / 2 - (8 * scale)All favicon files live in public/:
favicon.svg - Editable sourcefavicon.ico, favicon-16.png, favicon-32.png, apple-touch-icon.png - Generatedassets/favicon-gen.html - Preview page for all sizes (dark background so corner fringing is visible)Use when adding, removing, or significantly modifying a metadata field on books or files (e.g., adding a new field like "language" to the File model). Enumerates the cross-stack touchpoints, enforces a discovery-based workflow that uses the codebase itself as the checklist, and includes a verification phase that catches parallel code paths that would otherwise be missed.
Use when creating or updating the README splash image for Shisho