How do I target only Internet Explorer 10 for certain situations like Internet Explorer-specific CSS or Internet Explorer-specific JavaScript code?

I wouldn’t use JavaScript navigator.userAgent or $.browser (which uses navigator.userAgent) since it can be spoofed.

To target Internet Explorer 9, 10 and 11 (Note: also the latest Chrome):

@media screen and (min-width:0\0) { 
    /* Enter CSS here */
}

To target Internet Explorer 10:

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

To target Edge Browser:

@supports (-ms-accelerator:true) {
  .selector { property:value; } 
}

Sources:

• Moving Internet Explorer specific CSS into @media blocks
• How to Target Internet Explorer 10 and 11 in CSS
• CSS Hacks for Windows 10 and Microsoft’s Edge Web Browser