I\'m using word-break: break-all; and want to know how I can have the browser automatically insert the hyphens, as demonstrated in an MDN example.
word-break: break-all;
The -ms-hyphens property only works in IE10+. It's not possible in IE9 or below.
-ms-hyphens
See the browser compatibility chart at the bottom of the reference link you provided.
It doesn't work in Chrome yet: WebKit Hyphenation