This is by no means the minimum viable product. Oh man am I going to struggle to get 40! This list isn't really in any particular order, and Here goes nothing.

1-10

💐 Great and inclusive UX which puts nobody first
✒️ Engaging content led design
⛑️ Practical design
📱 Mobile first RWD
🐘 Support for large media
🐜 Support for teeny tiny devices
👻 Serverless
💸 Use Sass
🦄 100% code coverage
🥋 TDD of decent tests that actually test things

10-20

🕊️ Targeted contact and social (not all of them)
🦖 (appears) Fast to load, fast to paint.
🐌 No god damn carousels (stop moving!)
🌵 Secure, not prone to attacks
🌊 Architecture is simple as it can be
🌓 Night mode, evening mode, Day mode, morning mode
👔 Forms that are clever and models that are dumb
📁 Client side storage, I'm talking indexdb
🍨 Any JavaScript renderer, they are ALL good
⛓️ Blockchain based web, (IPFS)

20-30

🤸 UI uses devices sensors
👉 Left hand support
👈 Right hand support
🙅‍♂️ Look ma, no hands support
🌏 Knows where you live
🌬️ Knows the weather where you are
😩 Knows how you feel
🤖 Uses AI for good not eval
🐬 Uses Bluetooth for some reason
🏝️ Works offline

30-40

🐎 Tastefully subtle animation
🇺🇸 Multilingual international
✊ Multi touch UI
🎬 Original media
☕ No jokes about how much coffee you drink
👨‍🎨 3D art
🔍 The best search ever (if needed!)
➕ Small Ads
💳 That thing where you scan your card
☎️ Send SMS and format SMS from phone

Can you think of more? I want to do another this was fun!