@supports (display: flex) {
  /* Flexbox is available, so use it */
  .my-container {
    display: flex;
  }
}

In terms of syntax, @supports is very similar to @media, but instead of detecting screen size and orientation, @supports will detect whether the browser can handle a given CSS rule.

Rather than doing something like @supports (flex), notice that the rule is @supports (display: flex).

To detect multiple features at once, use the and operator.

@supports (transform: translateZ(1px)) and (transform-style: preserve-3d) and
  (perspective: 1px) {
  /* Probably do some fancy 3d stuff here */
}

There is also an or operator and a not operator:

@supports (display: flex) or (display: table-cell) {
  /* Will be used if the browser supports flexbox or display: table-cell */
}
@supports not (-webkit-transform: translate(0, 0, 0)) {
  /* Will *not* be used if the browser supports -webkit-transform: translate(...) */
}

For the ultimate @supports experience, try grouping logical expressions with parenthesis:

@supports ((display: block) and (zoom: 1)) or
  ((display: flex) and (not (display: table-cell))) or
  (transform: translateX(1px)) {
  /* ... */
}

This will work if the browser

1. Supports display: block AND zoom: 1, or
2. Supports display: flex AND NOT display: table-cell, or
3. Supports transform: translateX(1px).

Syntax

• @supports [condition] { /_ CSS rules to apply _/ }

Parameters

Remarks

Feature detection using @supports is supported in Edge, Chrome, Firefox, Opera, and Safari 9 and up.