UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36

Steps to reproduce the problem:
For details please see the animated gif attached.

Steps to reproduce:
1. Go to https://www.google.com.ua/?gfe_rd=cr&ei=v8N7WLLBM6y8zAWc4LyYDw (not sure about parameters. I was redirected there)
2. In the source panel open the file: https://www.google.com.ua/xjs/_/js/k=xjs.s.en.XJGZMwOs_g0.O/m=sx,c,sb,cdos,cr,elog,hsm,jsa,r,qsm,d,csi/am=AARKHi9YAPH_EBC3CBYkBgwGBQ/rt=j/d=1/t=zcms/rs=ACT90oEFTF9fNT7tE25IozlH1F5c2d4eow (most likely the path will be different when you open the page)
2. Set a breakpoint as it shown in the animated gif (at the very first line of code)
3. Reload the page. 
AR: When selecting the text it's not highlighted. Then if formatting (prettifying) the file, the text is not highlighting too.    

So the selection is working (it's possible to copy selected text), but highlighting isn't.
Also it's not reproducible for all the files. But setting a breakpoint at the file I specified let us to reproduce the issue every time.

What is the expected behavior?

What went wrong?
Bug.

Did this work before? N/A 

Chrome version: 55.0.2883.87  Channel: stable
OS Version: 10.0
Flash Version: Shockwave Flash 24.0 r0
 

Deleted: highlight_isnt_working.gif 966 KB

	highlight_isnt_working.gif 966 KB View Download