"Overflowing Off-Screen: A Flex Child with a No-Wrap Child

I encountered a perplexing issue with the flexbox layout that I can't wrap my head around. In my scenario, I have two columns - one with a fixed width and `flex-shrink: 0`, and the other with `flex-shrink: 1`, `flex-grow: 1`, and a child element that has `width: 100%`, `white-space: nowrap`, and `overflow-x: scroll` properties.

My expectation was for the left column to occupy the remaining space and allow overflow scrolling within its child element. However, what actually happens is that the content in the left column pushes the right column out of view.

You can view an example here: https://codepen.io/benlorantfy/pen/oNXKXOe

I am seeking an explanation for this behavior and any potential solutions to rectify it.

.flex-parent {
  display: flex;
  flex-direction: row;
}

.flex-child-1 {
  background-color: red;
  height: 200px;
  flex-grow: 1;
  flex-shrink: 1;
}

.nowrap-el {
  white-space: nowrap;
  width: 100%;
  overflow-x: scroll;
  background-color: grey;
}

.flex-child-2 {
  background-color: lightblue;
  height: 200px;
  width: 400px;
  flex-shrink: 0;
}
<div class="flex-parent">
  <div class="flex-child-1">
    <div class="nowrap-el">
      This should fill remaining space instead of pushing flex-child-2 off the screen. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Maecenas in augue volutpat, sagittis ante et, tincidunt mauris. Morbi vitae convallis erat, eget vulputate lacus.
      Nunc a justo aliquet, facilisis justo eget, semper velit. Nunc quis elementum tortor. Nam vestibulum aliquet nunc, id
    </div>
  </div>
  <div class="flex-child-2">This should not be shoved off screen</div>
</div>

Answer №1

To resolve this issue, I made a simple adjustment by including the CSS property overflow-x: hidden on the flex-child-1 element. Additionally, I added flex-basis: 0, although it may not have any significant effect on the layout. These changes instruct the browser to adhere to the specified widths and handle overflows correctly within the child elements. While I am unsure of the exact rationale behind this solution or where it is documented in the specifications, I welcome any insights from those familiar with this topic.

.flex-child-1 {
  background-color: red;
  height: 200px;
  flex-grow: 1;
  flex-shrink: 1;
  flex-basis: 0;
  overflow-x: hidden;
}

View the live demonstration here: https://codepen.io/benlorantfy/pen/ExjqJBM

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