Stretched:

Column
 
Row
 
Column
 
Row
Flex-start:

Column
 
Row
 
Column
 
Row

PASS .inline-flex 1 
PASS .inline-flex 2 
FAIL .inline-flex 3 assert_equals: 
<div class="inline-flex" style="align-items: flex-start;" data-expected-width="0" data-expected-height="0">
  <div style="contain: strict;" data-expected-width="0" data-expected-height="0">Row</div>
</div>
width expected 0 but got 30
FAIL .inline-flex 4 assert_equals: 
<div class="inline-flex" style="flex-direction: column; align-items: flex-start;" data-expected-width="0" data-expected-height="0">
  <div style="contain: strict;" data-expected-width="0" data-expected-height="0">Column</div>
</div>
width expected 0 but got 52
PASS .inline-flex 5 
PASS .inline-flex 6 
FAIL .inline-flex 7 assert_equals: 
<div class="inline-flex" data-expected-width="0" data-expected-height="0">
  <div style="contain: strict;" data-expected-width="0" data-expected-height="0">Row</div>
</div>
width expected 0 but got 30
FAIL .inline-flex 8 assert_equals: 
<div class="inline-flex" style="display: inline-flex; flex-direction: column;" data-expected-width="0" data-expected-height="0">
  <div style="contain: strict;" data-expected-width="0" data-expected-height="0">Column</div>
</div>
width expected 0 but got 52