The CSS WG has resolved  add a deprecated note to prevent the usage of 'overflow-wrap: break-word' in favor of 'overflow-wrap: anywhere'.
The new value is described as follows:
Firefox already shipped this feature
Chrome plans to implement this feature
I have sent the "intent to implement" request for Blink. Showing some public support in this bug would help to get the request approved.
Implementing this is a good idea. (You can consider this "public support.")
We already implement (the deprecated) word-break:break-word, which is defined to "have the same effect as word-break: normal and overflow-wrap: anywhere." Therefore, implementing this should be fairly straightforward.
From looking at WebKit source code (RenderStyle::breakWords()), it appears that word-break:break-word is currently treated identically to overflow-wrap:break-word, which I think is incorrect according to the spec text quoted above. It would be cool if this project fixed this, too (though, of course, fixing this could be tracked in a separate bug).
@Myles, The wrapping behavior of word-break:break-word / overflow-wrap: anywhere is the same as that of overflow-wrap:break-word, but the effect on intrinsic sizing is different. A quick bit of testing shows that safari has the expected sizing behavior difference between word-break:break-word and overflow-wrap:break-word.
To test, you can try this:
If you put overflow-wrap:break-word on the div, the longword will not wrap, but if you put word-break:break-word instead, it will.