M4RKYU.SYSEdition 2027
Skip to content
LOCEN/Ontario · CA/▸resources · specificityStandbyOK/--:--:--EST
M4M4RK_YUportfolio
  • BuildBuild
    BuildOverview
    • WorkSelected case studies and write-ups
    • GamesPlayable prototypes and game-dev logs
  • GalleryGallery
    GalleryOverview
    • PhotosPhoto collections and visual experiments
    • ShopPrints, posters, and one-off objects
  • WritingWriting
    WritingOverview
    • BlogLong-form devlogs and field notes
    • NotesShort observations, links, snippets
  • ResourcesResources
    ResourcesOverview
    • Tools38 in-browser developer utilities
    • LinksDaily-use dev and design bookmarks
  • AboutAbout
  • ContactContact
中文
All resources
№ 41 / 44·Tool
runs locally
cssreferencecascade

Specificity Calculator

Score any CSS selector's IDs, classes, and elements with a per-token breakdown — handles :is(), :not(), :where().

Source
[Previous toolcolor-mix() PlaygroundAll toolsNext tool]Keycode Inspector
M4RKYUM4RKYUM4RKYUM4RKYUM4RKYUM4RKYUM4RKYUM4RKYU
Crafted since 2024
ZhenXiao Mark YuZhenXiao Mark Yu
get in touch

Saw something here?Tell me about it.

It's a portfolio, not a service · but I read every note — drop a line if anything here resonated, or just to say hi.

Start a conversation
open channel

say hi anytime · 2026

--:--:--ESTOntario, Canada
  • Email
  • GitHub
  • dev.to
  • LinkedIn
  • Twitter / X
  • Instagram
  • Facebook
  • YouTube
  • CodePen
  • Spotify
  • Snapchat

Newsletter

Get the occasional dispatch

Notes and logs from m4rkyu.com — short, dated, no noise. Unsubscribe anytime.

Work

Production builds, games, and visual archives.

  • Projects
  • Games
  • Archive
  • Logs

Resources

Daily-use tools and a personal link library.

  • Search
  • Latest
  • Tools
  • Links
  • Notes
  • Topics
  • Shop
RSSJSON feed

Studio

Background, contact, and channels for collaboration.

  • About
  • Contact
  • Changelog
  • Colophon
  • Resumepending

Socials

Find me on the usual feeds.

  • GitHub
  • dev.to
  • LinkedIn
  • Twitter / X
  • Instagram
  • Facebook
  • YouTube
  • CodePen
  • Spotify
  • Snapchat
  • Email
© 2026 ZhenXiao Mark Yumarkyu0615@gmail.com
  • Email
  • GitHub
  • dev.to
  • LinkedIn
  • Twitter / X
  • Instagram
  • Facebook
  • YouTube
  • CodePen
  • Spotify
  • Snapchat
PrivacyTermsBuilt with Next.js 16 · React 19 · Tailwind 4