Web Content Accessibility Guidelines (WCAG) 2.0 recommendation suggested that text content is not justified. Ctrl++ 100-200% to view the "white" irregular space in a block of texts, called rivers of white. It is not accessible content.
F88: Failure of Success Criterion 1.4.8
due to using text that is justified (aligned to both the left and the right margins):
Many people with cognitive disabilities have a great deal of trouble with blocks of text that are justified (aligned to both the left and the right margins). The spaces between words create "rivers of white" running down the page, which can make the text difficult for some people to read. This failure describes situations where this confusing text layout occurs. The best way to avoid this problem is not to create text layout that is fully justified (aligned to both the left and the right margins).