ads.txt
An IAB ads.txt listing authorised digital sellers with account IDs and relationships (sample data) — for testing ads.txt parsers and ad-fraud tooling.
Web assets
The web-assets category ships the supporting files every website and web app carries — the ones you rarely author by hand but constantly need to test against. The favicon set has a multi-resolution .ico, a scalable SVG favicon, and an apple-touch-icon, plus Windows cursor (.cur) samples with real hotspots. The PWA set is a complete web app manifest with a full icon spread (192, 512, and a maskable variant), a cache-first service worker, and a browserconfig.xml tile definition. Social preview cards are rendered at the exact Open Graph (1200×630) and Twitter summary (1200×600) sizes. The crawler set covers robots.txt, an XML sitemap, humans.txt, and ads.txt, and the .well-known set has an RFC 9116 security.txt, an Apple app-site-association file, and an Android assetlinks.json. There's also an SVG symbol sprite paired with its PNG twin. Every file is a realistic, standards-compliant sample against fictional example.com data — for testing crawlers, PWA installers and manifest validators, favicon and icon pipelines, service-worker registration, link-preview generators, and .well-known parsers.
Crawlers
humans.txt
A humans.txt crediting the people and stack behind a site, in the conventional TEAM/SITE block format — for testing plain-text metadata parsers.
robots.txt
A robots.txt with wildcard and per-agent rules, a crawl-delay, and a sitemap reference — for testing robots parsers and crawler policy handling.
sitemap.xml
An XML sitemap (sitemaps.org 0.9) with loc, lastmod, changefreq, and priority for several URLs — for testing sitemap parsers and crawl-scheduling tools.
Favicons
Apple touch icon (180×180 PNG)
A 180×180 opaque PNG apple-touch-icon (iOS rounds the corners itself) — for testing home-screen icon extraction and Apple touch-icon handling.
Favicon (multi-size ICO)
A multi-resolution favicon.ico bundling 16, 32, 48, and 64 px images of the brand mark — for testing favicon parsers, ICO decoders, and multi-image icon handling.
Favicon (scalable SVG)
A scalable SVG favicon of the brand mark — the modern crisp-at-any-size icon format, for testing SVG favicon support and vector-to-raster favicon pipelines.
Well Known
apple-app-site-association
An Apple app-site-association file declaring Universal Links, web credentials, and app clips — normally served without an extension at /.well-known/, for testing AASA parsers (shown here as .json).
assetlinks.json (Android)
An Android Digital Asset Links file granting app-link handling to a package via a certificate fingerprint (sample) — for testing assetlinks.json parsers and App Links verification.
security.txt (RFC 9116)
An RFC 9116 security.txt with Contact, Expires, Encryption, and Policy fields — normally served at /.well-known/security.txt, for testing security.txt parsers.
Cursors
Arrow cursor (.cur, hotspot 0,0)
A 32×32 Windows arrow cursor with its hotspot at the top-left tip (0,0) — for testing .cur parsers, CSS custom cursors, and ICO/CUR converters.
Crosshair cursor (.cur, hotspot 16,16)
A 32×32 Windows crosshair cursor with its hotspot at the centre (16,16) — for testing cursor hotspot handling and .cur decoding.
Pwa
browserconfig.xml (MS tiles)
A browserconfig.xml defining Windows Start-menu tile logos and colour — for testing MS tile configuration parsers and XML handling.
PWA icon (192×192 PNG)
A 192×192 PNG app icon referenced by the web app manifest (purpose 'any') — for testing PWA icon pipelines and manifest icon resolution.
PWA icon (512×512 PNG)
A 512×512 PNG app icon referenced by the web app manifest (purpose 'any') — for testing PWA icon pipelines and manifest icon resolution.
PWA maskable icon (512×512 PNG)
A 512×512 maskable PNG icon with the mark inside the central safe-zone and a full-bleed background — for testing maskable icon cropping across Android adaptive-icon shapes.
Service Worker (sw.js)
A sample cache-first service worker handling install, activate, and fetch events with an offline fallback — for testing service-worker registration, JS parsers, and PWA tooling.
Web App Manifest (.webmanifest)
A complete Progressive Web App manifest with a full icon spread, shortcuts, categories, and theme colours — for testing PWA installers, manifest validators, and JSON parsers.
Sprites
PNG icon sprite (5-icon strip)
A 320×64 PNG icon sprite (five 64×64 cells) — the raster twin of the SVG sprite, for testing background-position sprite techniques and sprite slicers.
SVG icon sprite (symbol sheet)
An SVG sprite sheet defining five reusable icons as <symbol> elements referenced by <use href='#id'> — for testing SVG sprite pipelines and icon systems. Paired with a PNG sprite twin.
Social
Open Graph card (1200×630 PNG)
A 1200×630 Open Graph preview card at the exact og:image aspect ratio — for testing link-preview generators, social-card renderers, and image pipelines.
Twitter summary card (1200×600 PNG)
A 1200×600 Twitter summary-large-image card at the 2:1 aspect ratio — for testing Twitter/X card renderers and social preview pipelines.