Chrome Version: (copy from chrome://version)
OS: (e.g. Win10, MacOS 10.12, etc...)

What steps will reproduce the problem?
(1) Start Chrome with LayoutNG enabled
(2) Navigate to data:text/html, <div id="first">one <span id="start"></span>two three</div>
(3) Inspect the offsetLeft/Top property of the span

What is the expected result?

Should get non-zero result.

What happens instead?

Got 0.

Note that the spec isn't clear about what to return when the element doesn't have any box:

https://drafts.csswg.org/cssom-view/#dom-htmlelement-offsetleft:

  "... Return the result of subtracting ... from the x-coordinate of
   the left border edge of the first CSS layout box associated with
   the element ..."