How to use automatic CSS hyphens with `word-break: break-all`?

Question

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.

div {
  width: 80px;
  height: 80px;
  display: block;
  overflow: hidden;
  border: 1px solid red;
  word-break: break-all;
  hyphens: auto;
  -ms-hyphens: auto;
  -moz-hyphens: auto;
}

<div>aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa</div>

Answer 1

The word-break property and hyphenation are two completely different things. The first one, originally intended for East Asian languages mainly, does bad things to languages like English: it arbitr arily cuts w ords at some poi nts without ind icating that a word has been broke n.

So you should decide whether you have an expression where a line break can be inserted by a browser at any point or whether you want hyphenation.

For hyphenation, the CSS code as such is OK, though many people would advice putting the standard property setting hyphens: auto last, after prefixed properties. But it requires that the language of the text be declared in HTML markup, using e.g. <div lang=en>. Moreover, browser support is still limited: IE 9 does not support such hyphenation, and the support in IE 10 covers a relatively small set of languages (including English of course).

For automatic hyphenation on IE 9, you would need to use either server-side programmed hyphenation or, simpler, client-side hyphenation with tools like Hyphenator.js.