mouse cursor in selector higlight boundingbox in client side

Hi

Is thee a way ( if already implemented ) that when a css file is open , that when a cursor is inside a selector  (mix of selector)
that phpstrom higlight the bounding area  in the client side  ?
I focus on  css file since some html content can only be view in the client side  when use javascript si  ican't select this html tag in javascript on in html ( widget create call by javascript ) .

here what i call a mix of selector
.ui-dialog .ui-dialog-title { float: left; margin: .1em 16px .1em 0; }