Update :
Safari now supports keep-all as a value. As of Safari 9.
word-break property is partially supported in Safari, i.e it only supports word-break if you use break-all as a value and not keep-all...
As you can see here (Read the note at very bottom) which says
Note: Partial support refers to supporting the "break-all" value, but
not the "keep-all" value.
Bug Report 43917 - CSS3 'word-break: keep-all' is not supported
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