Test to see if text-emphasis-position is supported

Prefixes used

HTML

#left {
   
    -webkit-writing-mode: vertical-rl;
}
#right {
  
    -webkit-writing-mode: vertical-rl;
}

CSS

#over {
    -webkit-text-emphasis-position: over;
}
#under {
    -webkit-text-emphasis-position: under;
}
#left {
   
    -webkit-writing-mode: vertical-rl;
}
#right {
  
    -webkit-writing-mode: vertical-rl;
}