flex-flow:
<‘flex-direction’> || <‘flex-wrap’>;

Syntax details:
Name:
flex-direction
Value:
row | row-reverse | column | column-reverse
Initial:
row
Applies to:
flex containers
Name:
flex-wrap
Value:
nowrap | wrap | wrap-reverse
Initial:
nowrap
Applies to:
flex containers

(||): One or more of them must occur, in any order.

(|): Exactly one of them must occur.

Applies to: #container

🌼
1️⃣
2️⃣ 2️⃣
3️⃣ 3️⃣ 3️⃣
4️⃣ 4️⃣ 4️⃣ 4️⃣
5️⃣ 5️⃣ 5️⃣ 5️⃣ 5️⃣
🌼
Base code:

Equivalent to:

https://www.w3.org/TR/css-flexbox-1/#flex-flow-property