This filter plugin allows teachers to embed interactive quizzes from Sbornik Testov (sborniktestov.ru) — a free quiz platform with over 15,000 quizzes — into any text area in Moodle: course descriptions, pages, assignments, forums, labels and more.

Usage: type {sborniktestov id=12345} in any text editor. The filter replaces it with an embedded interactive quiz.

Features:
- Simple tag syntax with optional parameters for fine-tuning
- Customisable colours, fonts, border radius and padding
- Toggle visibility of title, description, statistics, comments and related quizzes
- Optional auto-embedding of links to sborniktestov.ru quiz pages
- Automatic iframe height adjustment via postMessage
- Admin settings page with global defaults
- Privacy API implementation (no Moodle user data is transmitted)
- English and Russian language packs

The plugin loads quiz content from sborniktestov.ru via an iframe. No API keys or subscriptions are required. The external service receives only standard HTTP request data (IP, user agent) and may set an anonymous cookie for quiz result tracking.