text wrapping doesn't work properly when sentence contains both Chinese and English

[Adagio-cantabile]

Hi, I've read your blog post https://blog.datawheel.us/english-is-not-chinese-69b43959bb47, thanks for the work! But the example does not work when Chinese is combined with English, when putting an English sentence between, spaces between English words does not show up.

Expected Behavior

Spaces of English words show correctly

Current Behavior

Spaces between English words disappears

Steps to Reproduce (for bugs)

http://jsfiddle.net/gest45z9/12/

Your Environment

• Browser Name: Chrome
• Operating System and Version: MacOS Sierra v10.12.6