Fumen

General resource: https://tetrisconcept.net/threads/a-quick-introduction-to-fumen.2739/

/* flags: Fumen options on the page
     - colorize: If true, apply guideline color to block
     - lock: If true, lock mino after placement
     - mirror: If true, flip field horizontally after placement
     - quiz: If true, comment is in quiz format
     - rise: If true, rise garbage after placement */  
console.log(page.flags);// { colorize: true, lock: true, mirror: false, quiz: false, rise: false }