UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.62 Safari/537.36

Steps to reproduce the problem:
1. Load test4.html
2. 
3. 

What is the expected behavior?
AAA in red
AAA in blue

What went wrong?
AAA in red
AAA no color

Did this work before? No 

Does this work in other browsers? No
 Chrome doesn't work if a tag's ID is all numeric.  The current HTML spec states:  "IDs can consist of just digits, start with a digit, start with an underscore, consist of just punctuation, etc."

See:  https://www.w3.org/TR/html5/dom.html#element-attrdef-global-id

Chrome version: 67.0.3396.62  Channel: stable
OS Version: 17.3
Flash Version: Shockwave Flash 29.0 r0

This is a problem because I sometimes use a UUID as an element ID in order to avoid global issues.  When the UUID starts with a number, it doesn't work.
 

Deleted: test4.html 372 bytes

test4.html 372 bytes View Download