Version: Chrome 56.0.2906.0 dev (64-bit)
OS: Ubuntu 16.10

What steps will reproduce the problem?
(1) Visit https://jsfiddle.net/m2874knm/

What is the expected output?
 No red should be visible. (The blue element should be at its container's top-left corner.)

What do you see instead?
 Red is visible. Specifically: the blue element seems to be pushed down by the "hello" text, revealing the container's red background.

Please use labels and text to provide additional information.
If I remove the "hello" text, then I get "expected output". But this text really shouldn't make a difference for the positioning of the blue abspos element. Abspos children are supposed to get their static position in a way that's not influenced by the in-flow children.

I *think* what's happening here is that Blink is (incorrectly) grouping the abpos child to be inside of the raw text's anonymous flex item. I'll post another testcase to demonstrate this more clearly.