= Privacy Features in WebKit
''by John Wilander''

- WebKit Tracking Prevention Policy
    - http://webkit.org/privay-prevention-policy
- Privacy Defaults Timeline
    - 2003 Third-parties without pre-existing cookies cannot set cookies
    - 2013 Caches and HTML5 storage partitioned per website
    - 2017 Intelligent Tracking Prevention deletes tracking cookies
    - 2018 The Storage Access API asks for user permission
    - 2019 Private Click Measurement (proposed standard)
- How to Enable ITP
    - “Resource Load Statistics”
    - Classification there for all ports
    - Cocoa-specific:
        - Public Suffix List
        - Cookie blocking (HTTP and JS)
        - HTTP referrer downgrade
        - HSTS restrictions
- The Storage Access API
    - Prompt: Do you want to allow “third party video.example” to use cookies and website date while browsing news.example
- What is Ad Click Attribution?
    - You buy something, where did the purchase come from, an ad?
    - Search for something click and ad
        - If you add the item to shopping cart
        - Cookie is set and read by search provider
        - ITP prevents this, no matching 
- [https://webkit.org/blog/8943/privacy-preserving-ad-click-attribution-for-the-web/ Private Click Measurement]
    - 1. Store Ad Clicks internally
    - 2. Match conversions against stored clicks
    - 3. Send out attribution data
    - Provides aggregate measurement of ad clicks
- Next Up
    - isLoggedIn API
        - Differentiate between logged in and casual visits
        - Proposed at W3C TPAC