Ignore flex container children but not grandchildren

Question

I have a simple flex element with some children, something like this:

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Answer 1

Use display:contents (https://css-tricks.com/get-ready-for-display-contents/) but pay attention to the support (https://caniuse.com/#feat=css-display-contents)

.container {
  display: flex;
  flex-wrap: wrap;
}

.container div.flex-box {
  width: 200px;
  margin: 20px;
  padding: 20px;
  font-size: 40px;
  border: 1px solid;
}

.subcontainer {
  display: contents
}

<div class='container'>
  <div class='flex-box'>one</div>
  <div class='flex-box'>two</div>
  <div class='flex-box'>three</div>
  <div class='subcontainer'>
    <div class='flex-box'>four</div>
    <div class='flex-box'>five</div>
  </div>
  <div class='flex-box'>six</div>
</div>

Answer 2

If the element is a child of a flex container, then it becomes a flex item. That's the general rule.

However, most browsers will ignore that rule when the child is absolutely positioned.

I'm not sure that's a useful solution in this case, but that's what you would have to do: absolutely position .subcontainer and make it flex container, so that the children become flex items.