Why is it that even after all these years web-browsers still can't justify text properly, even though good old news-papers can? I think this is a hugely import

Why is it that even after all these years web-browsers still can't justify text properly, even though good old news-papers can? I think this is a hugely important issue because most of the world's reading probably happens via a browser currently. If we can make it more readable it will help the humankind, even a small improvement has huge rewards since so many people are using the web. Do we need to invent some kind of AI to do this? I think this would be a great test for wannabe AI.