It seems they link to a discussion page [1], which references this document (I can't find a published version): Computer text line lengths affect reading a

It seems they link to a discussion page [1], which references this document (I can't find a published version): Computer text line lengths affect reading and learning Peter Orton https://cdn.tc-library.org/Edlab/eye-tracking%20article.pdf But it seems that Peter Orton has published quite a few works in this area [2], [3]. Specifically [3] seems to note that with a less wide text column width readers are not statistically significant faster (but are a bit), but do see that for difficult reading content, the shorter width requires less re-reading then a wider one along with significantly better retention of the contents of the document. [1] https://www.mediawiki.org/wiki/Reading/Web/Desktop_Improvements/Features/Limiting_content_width https://www.mediawiki.org/wiki/Reading/Web/Desktop_Improveme... [2] https://www.scienceopen.com/document_file/671b2d53-73ce-4a91-946d-fde0b7db381a/ScienceOpen/015_Beymer.pdf https://www.scienceopen.com/document_file/671b2d53-73ce-4a91... [3] https://sci-hub.se/https://link.springer.com/chapter/10.1007/11555261_59 https://sci-hub.se/https://link.springer.com/chapter/10.1007...