Created attachment 8886111 [details] mURTf_AUSdG78Olw7_D6OQ.png User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36 Steps to reproduce: 1. create flex container 2. create inner element 3. add some vertical margin or padding (if inner elem have not display:table) in percent p.s. if parent flex container has fixed height then vertical margin or padding is work Actual results: In the inner element padding or margin, is equal 0 Expected results: vertical padding or margin should have some value, not 0
Component: Untriaged → Layout
Product: Firefox → Core
This is a P1 bug without an assignee. P1 are bugs which are being worked on for the current release cycle/iteration/sprint. If the bug is not assigned by Monday, 28 August, the bug's priority will be reset to '--'.
Please don't set the Priority field unless you're part of the team who works on these bugs. This is definitely not a P1. Definitely an annoying bug, but more like P4 as per https://dbaron.org/log/20090120-bug-priorities
Severity: critical → normal
Priority: P1 → --
Can you attach a testcase that demonstrates the issue that is as simple as possible, please?
https://codepen.io/Dezmonds/pen/YrqOwm I added bug preview on this link, on Mozilla vertical margin in percent is null
status-firefox57: --- → wontfix
status-firefox58: --- → affected
Priority: -- → P3
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