Chrome Version: 66.0.3359.26 (Official Build) dev (64-bit)
OS: Ubuntu 18.04 (prerelease)

What steps will reproduce the problem?
(1) Load https://jsfiddle.net/b87re0vw/

What is the expected result?
None of the text inside the tables should wrap.

What happens instead?
The text inside the second table *does* wrap, for no clear reason.

Please use labels and text to provide additional information.
In both cases, there is a <td nowrap="nowrap">.

In the first table, that gives the descendant div a computed "white-space" of "nowrap". But in the second table, it does not, for some reason. The only difference is that the second table has an explicit width on its <td> element (which in this example is quite large, so it's not causing wrapping by being the thing that constrains the width).

Devtools shows me that this nowrap="nowrap" behavior involves the following UA stylesheet rule:
> td[Attributes Style] {
>     white-space: -webkit-nowrap;
> }

And apparently -webkit-nowrap has some magic "width" dependence, or something...? not sure. Anyway, Firefox and Edge are consistent on this -- they render both tables with no line wrapping.  This causes an interop bug on this very bug tracker, too :)  See https://bugzilla.mozilla.org/show_bug.cgi?id=1445634