# jbtronics/CrookedStyleSheets

Webpage tracking only using CSS (and no JS)

Repository: https://github.com/jbtronics/CrookedStyleSheets
Canonical: https://ross.abutalabs.com/products/crookedstylesheets
Language: CSS
License: MIT
License Family: permissive
Topics: css, css-tricks, html5, web-tracking, proof-of-concept
Last push: 2022-07-12T21:47:12+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 3160, "days_push": 1513, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 3270, forks 132 (observed 2026-08-28T04:07:53.061781+00:00)

## What it is
A proof-of-concept demonstrating website tracking and analytics using only CSS, without any JavaScript. It detects browser type, screen resolution, font installation, link clicks, and hover behavior by triggering server-side requests via CSS properties.

## Use cases
- track website visitors without javascript
- detect installed fonts via css
- demonstrate css-based privacy risks
- fingerprint browsers using css media queries
- log user link clicks and hovers server-side
- study tracking techniques for privacy research

## When to choose
- researching or demonstrating CSS-based tracking and privacy threats
- building educational material on browser fingerprinting
- testing privacy tools against non-JavaScript tracking

## When to avoid
- production analytics for real applications
- comprehensive visitor tracking with reliable metrics
- projects requiring active maintenance or support

## Facets
- artifact type: library
- maturity: maintenance
- function: security, analytics, css-framework
- domain: security, privacy, web-development, analytics
- platform: browser, php
- tags: css-tracking, proof-of-concept, user-privacy, no-javascript, browser-fingerprinting, web-server

## Member repositories
- jbtronics/CrookedStyleSheets (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:53.061781+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T07:23:09.091587+00:00, confidence not recorded.
  - readme: https://github.com/jbtronics/CrookedStyleSheets (fetched 2026-08-28T04:07:53.061781+00:00, sha 5fd50f5644ee)
- Data as of 2026-08-30T08:39:29.467469+00:00.