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https://cssminifier.com/
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* > .aaa + .bbb .ccc   ~ .text-x {
	color : blue;
	width : /*x*/ calc(   1.5em + 0.5rem/*e*/ + 2px    );
}
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*>.aaa+.bbb .ccc~.text-x{color:#00f;width:calc(1.5em + .5rem + 2px)}
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NOTE: it thorughly removed the comments
NOTE: it removed the last ;
NOTE: it kept the spaces in calc()
NOTE: it even changed 'blue' to '#00f'
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@media ( min-width : 800px ) {
	.main {
		background : red ;
	}
}
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@media (min-width :800px){.main{background:red}}
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NOTE: it doesn't remove the space after '@media' and after 'min-width'
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.test1c::before {
	font-family : "Times New Roman";
	width :		  -0.345vw;
	color : green;
	width : intercalc(   1.5em + 0.23rem/*e*/ + 2px    );
	content : "1c\"xy";
}
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.test1c::before{font-family:"Times New Roman";width:-.345vw;color:green;width:intercalc(1.5em + .23rem + 2px);content:"1c\"xy"}
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NOTE: it changed "-0.345" to "-.345"
NOTE: it treated 'intercalc' just like 'calc'
NOTE: it kept \" in the content string
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/*

.test1a::before {
	color : red;
	content : "1a:x */ y";
}*/
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/* Invalid character(s) 'y";
}*/
' at 5:20. Ignoring. */
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NOTE: it accepted */ in the string as the closing tage of the comment but
		it generated an error message, calling the rest, 'y" }*/' invalid
		characters
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