Full justify is great for reading much better than left justification. However the justification and hyphenation engines in Browsers suck. Or rather, they lack an engine to hyphenate so that you do not get big gaps. Further more it means that letter spacing isn't dynamic either in browsers.
A lot of work went in TeX to properly do full justification, but this technology was never copied to browsers.
So for browsers, left align in basically the only option.
Keep in mind that the justification engine of a word processor or web browser is rudimentary compared to that of a professional page-layout program. So if I’m making a word-processor document or web page, I’ll always left-align the text, because justification can look clunky and coarse. Whereas if I’m using a professional layout program, I might justify.
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Full justify is great for reading much better than left justification. However the justification and hyphenation engines in Browsers suck. Or rather, they lack an engine to hyphenate so that you do not get big gaps. Further more it means that letter spacing isn't dynamic either in browsers.
A lot of work went in TeX to properly do full justification, but this technology was never copied to browsers.
So for browsers, left align in basically the only option.
The site you linked has a similar conclusion: