Created attachment 466833 [details]
Screenshoft of the first case

First case:
1. Open http://book.mixu.net/distsys/single-page.html
2. Find the paragraph start with 'This text is focused on distributed programming' and triple click on it

Second case:
1. Open https://www.visuality.pl/posts/a-simple-guide-to-pessimistic-locking-in-rails
2. Press Command+A to select all the page and bring 'Show me the code' section

Expected:
Consistent selection like Chrome

Actual:
There is unexpected horizontal selection gaps

See the attachment