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CSS - Flex - Flex Flow

About

flex-flow is a css shorthand notation that takes as value:

Example multi-line container

Note: This three examples are based on a row of div an shows the effect of the flex-flow value.

They just differs in their flex-flow value.

They share all: 

<div class="flex">
  <div class="item">1</div>
  <div class="item">2</div>
  <div class="item">3</div>
  <div class="item">4</div>
</div>

.flex {
  display: flex;
  width: 300px;
  margin:2rem;
}
.item {
  width: 80px;
  background-color: SkyBlue;
  border: 1px solid #e7e7e7;
  text-align: center;
  box-sizing: border-box;
  height: 20px;
}

row wrap

.flex {
  flex-flow: row wrap;
}
Rendered by WebCode

row-reverse wrap-reverse

.flex {
  flex-flow: row-reverse wrap-reverse;
}
Rendered by WebCode

column wrap

.flex {
  flex-flow: column wrap;
  width: 160px;
  height: 60px; 
  box-sizing: border-box;
}
Rendered by WebCode

Documentation / Reference