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IE 11 flexbox child width not respecting content (Safari too)

I have a strange bug that I seem to keep stumbling upon and I'd like to know what is actually going on here. I have a flexbox container (row wrap) with two child divs (flex: 1). When I have a heading that I don't want to wrap (white-space: nowrap), IE 11's containing div doesn't respect its width and shrinks to less than the header width. This seems to work just fine in Chrome, but Safari and IE seem to not respect the heading's width. What's going on here?

Here is the js bin: https://jsbin.com/bowodiz/edit?css,output

I have put the main styles and markup inline below for convenience sake.

HTML: 

<div class="flex-container">

    <div class="left">
      <div class="heading">Here is a heading that shouldn't wrap</div>
      <div class="sub-text">This is just some content that should wrap just fine ..</div>
    </div>

    <div class="right">
      <div class="heading">Here is a heading that shouldn't wrap</div>
      <div class="sub-text">This is just some content that should wrap just fine ...</div>
    </div>

</div>

CSS (partial):

.flex-container {
  display: flex;
  flex-flow: row wrap;
  justify-content: space-between;
}

.flex-container > div {
  flex: 1;
}

.heading {
  white-space: nowrap;
}

Desired:

Desired side by side state

Desired wrapped state

IE/Safari Behavior:

enter image description here

Solution

  • Instead of flex: 1 use flex-grow: 1; flex-basis: 0; or specify all 3 values that you want for the shorthand. And if you specify flex-basis make sure you specify a unit. https://jsbin.com/ketolifuhu/edit?html,css,output

    Here's a good article that covers some of the bugs and inconsistencies https://philipwalton.com/articles/normalizing-cross-browser-flexbox-bugs/

    :root {
    --dark-primary-color: #303F9F;
    --default-primary-color: #3F51B5;
    --light-primary-color: #C5CAE9;
    --text-primary-color: #FFFFFF;
    --accent-color: #FF4081;
    --primary-text-color: #212121;
    --secondary-text-color: #757575;
    --divider-color: #BDBDBD;
    --box-size: 150px;
    font-family: Roboto, 'sans-serif';
    font-size: 20px;
    letter-spacing: 1.25px;
    font-weight: 100;
    color: white;
}

body {
  background-color: #BDBDBD;
}

.flex-container {
  display: flex;
  flex-flow: row wrap;
  justify-content: space-between;
}

.flex-container > div {
  flex-grow: 1;
  margin: 10px;
  box-shadow: 2px 2px 6px 1px rgba(0,0,0,.2);
  padding: 30px;
  flex-basis: 0;
}

.left {
  background-color: #3F51B5;
}

.right {
  background-color: #3F51B5;
}

.heading {
  letter-spacing: .5px;
  font-weight: 400;
  white-space: nowrap;
}

.sub-text {
  margin-top: 20px;
  font-size: 14px;
}
    <!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <link href="https://fonts.googleapis.com/css?family=Roboto:100,400" rel="stylesheet">
  <title>JS Bin</title>
</head>
<body>

  <div class="flex-container">
    
    <div class="left">
      <div class="heading">Here is a heading that shouldn't wrap</div>
      <div class="sub-text">This is just some content that should wrap just fine and I don't really care what it says, but it'll just wrap just fine and that behavior should be handled by the heading.</div>
    </div>
    <div class="right">
      <div class="heading">Here is a heading that shouldn't wrap</div>
      <div class="sub-text">This is just some content that should wrap just fine and I don't really care what it says, but it'll just wrap just fine and that behavior should be handled by the heading.</div>
    </div>
    
  </div>
  
  
</body>
</html>