Sass mixin to set the placeholder color of input elements

mixin.scss

//	Set the color of placeholder text in input fields
@mixin set-placeholder-color($color) {
	// scss-lint:disable PseudoElement, VendorPrefix
	::-webkit-input-placeholder { // WebKit, Blink, Edge
	    color: $color;
	}
	:-moz-placeholder { // Mozilla Firefox 4 to 18
	   color: $color;
	   opacity: 1;
	}
	::-moz-placeholder { // Mozilla Firefox 19+
	   color: $color;
	   opacity: 1;
	}
	:-ms-input-placeholder { // Internet Explorer 10-11
	   color: $color;
	}
	:placeholder-shown { // Standard (https://drafts.csswg.org/selectors-4/#placeholder)
	  color: $color;
	}
}