UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.139 Safari/537.36

Steps to reproduce the problem:
1. Create <fieldset style="height: 600px; display: flex; flex-flow: column nowrap">
2. Put inside two or more flex:1 <div>
3. Children's not respect flex property (nothing changes)

What is the expected behavior?
Children's justify space in parent

What went wrong?
Reproducing bug:
https://playcode.io/84018?tabs=app.html&style.css&output

Did this work before? N/A 

Does this work in other browsers? Yes

Chrome version: 66.0.3359.139  Channel: stable
OS Version: Manjaro
Flash Version:
 

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