[css-writing-modes] Margin Collapsing Orthogonal Flows

GĂ©rard has been testing Writing Modes and found an interesting
discrepency between Webkit/Blink and Gecko:

<horizontal-tb>
   <vertical-lr>
     <p>I have margins</p>
   </vertical-lr>
</horizontal-tb>

In Firefox, the left and right margins of the <p> collapse out
through the content edge of <vertical-lr>.

In Webkit, they are contained by <vertical-lr>'s content box.

I am wondering what is the preferred behavior in such a case:
should these margins collapse?

~fantasai

Received on Saturday, 20 December 2014 00:32:42 UTC