BG color in conditional comments

Hi there,

This is Language Injection (color can be configured in "Settings | Editor | Colors & Fonts | General | Injected language fragment").

• This will affect all Language Injections (not just in conditional comments).
• Injection in conditional comments is required in order to have code completion/validation .. otherwise such content will be treated as ordinary comment.

i dont understand the idea behind injected languages could you explain this to me

• http://www.jetbrains.com/phpstorm/webhelp/using-language-injections.html
• http://blog.jetbrains.com/phpstorm/2013/06/language-injection-in-phpstorm/
• ...
  

when i hit alt enter nothing comes up to say it is a injected language

Hard coded injections cannot be disabled (v8 may have hidden setting to disable this).