A solution to a problem nobody has
As with hyphenation, full justification (or justification) — as opposed to ragged text — can be done well, under certain, limited circumstances. Online, these circumstances are rarely encountered.
As a column of text gets narrower, the worse justification will make it look. With wider columns, word spacing is able to be fairly consistent from line to line, but with narrower columns, the gaps on some lines become an unsightly distraction.
As with hyphenation, there exists software that can handle justification intelligently. This software is not part of today’s web browsing experience.