Describe the bug
At the console: The pseudo class ":first-child" is potentially unsafe when doing server-side rendering. Try changing it to ":first-of-type".

To Reproduce
Run the angular demo in this repo and check the console.

Expected behavior
No error log

System:

• OS: [Windows10,]
• Device: [Desktop]
• Browser: [Chrome]
• Framework: [angular]
• Addons: [all]
• Version: [5.1.1 and 5.2.0-alpha.21]