Which CSS selector can be used to select a flex bo

问题:

I have a display:flex row with 3 columns and flex-wrap is enabled. Between the columns are handle divs. When the columns are wrapped the handle divs should disappear. How can I use the wrap-state as a CSS selector to define attributes for that case, that the flex items are wrapped?

section {
  display: flex;
  flex-wrap: wrap;
  background-color: lightgray;
}
section * {
  margin: 1ex;
  background-color: white;
}
section * ~ * {
  margin-left: 0;
}
.handle {
  width: 1ex;
  background-color: gray;
}
aside, article {
  flex: 1;
  min-width: 5em;
}
#wide {
  width: 30em;
}
#narrow {
  width: 10em;
}

<section id="wide">
  <aside>
    left
  </aside>
  <div class="left handle"></div>
  <article>
    middle
  </article>
  <div class="right handle"></div>
  <aside>
    right
  </aside>
</section>
<hr>
<section id="narrow">
  <aside>
    top
  </aside>
  <div class="left handle"></div>
  <article>
    middle
  </article>
  <div class="right handle"></div>
  <aside>
    bottom
  </aside>
</section>

In non-wrapped mode I need to suppress the left margin and in wrapped-mode the top margin and the handles must be suppressed. How to know when being wrapped?

回答1:

There is no CSS selector to select specifically wrapped flex items, unfortunately.

(It's unlikely that any such selector will be added, because it'd create weird circular dependencies. e.g. suppose a flex item wraps because it's too wide for the first line -- and then you select it & restyle it to be skinny, which means it no longer wraps. So then the selector should no longer match -- but then it's wide again, which makes it wrap... etc.)