[css3-flexbox] width:flex() in DOM

How should be flexible width exposed in DOM, in particular in existing APIs?

I think I have the answer, just want to check:
If something has "width:flex(1)",

element.style.width returns the specified value - "flex(1)" or "flex(1 0 auto)" (should be ok to expand the defaults).
getComputedStyle() returns used value (pixels), after any flexibility has done its damage.
element.offsetWidth returns pixels as well

Right?