how to detect IE and Edge browsers in CSS?

For IE 9 and lower, load a conditional stylesheet:

<!--[if IE]>
   <link rel="stylesheet" type="text/css" href="ie.css" />
<![endif]-->

IE 10 and up doesn't support this, so you have to use media queries:

@media all and (-ms-high-contrast: none), (-ms-high-contrast: active) {
   /* IE10+ CSS */
}

For Edge 12-15:

@supports (-ms-accelerator:true) {
   /* Edge 12+ CSS */ 
}

EDIT

For Edge 16+

@supports (-ms-ime-align:auto) {
    /* Edge 16+ CSS */ 
}

The accepted answer for Edge isn't working in Edge 16.

This alternative works:

@supports (-ms-ime-align:auto) {
    /* IE Edge 16+ CSS */ 
}

Via https://stackoverflow.com/a/32202953

(Adding new answer as I don't have comment privileges.)

Not sure about edge, but to target ie 10/11 you can use:

@media screen and (-ms-high-contrast: active), (-ms-high-contrast: none) {
  //styles
}

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