How to check if css value is supported by the browser?

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There is the new API CSS.supports. Supported in most browsers except IE.

console.log(
  // CSS.supports(property, value)
  1, CSS.supports("text-decoration-style", "blink"),
  2, CSS.supports("display", "flex"),
  3, CSS.supports('--foo', 'red'),
  4, CSS.supports('(--foo: red)'),

  // CSS.supports(DOMstring)
  5, CSS.supports("( transform-origin: 5% 5% )"),
  6, CSS.supports("( transform-style: preserve ) or ( -moz-transform-style: preserve ) or " 
  + "( -o-transform-style: preserve ) or ( -webkit-transform-style: preserve )")
)

And there is a similar feature in CSS, the @supports feature query selector, also supported in most browsers except IE:

@supports (display: grid) {
  div {
    display: grid;
  }
}
@supports not (display: grid) {
  div {
    float: right;
  }
}

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