6 YEARS LEATER!!! YUI Compressor still does not fully respect CSS3’s calc() or clamp() grammar. THE PROJECT IS DEAD.

[R-W-C]

Whitespaces which are required (around the plus sign) are not respected.

Valid CSS rule:

body {
    --fontSize: clamp(
    var(--fontSizeReg),
    calc(0.3766rem + 1.2987vw),
    var(--maxFontSizeReg)
    );
}

or

body { --fontSize: clamp(var(--fontSizeReg), calc(0.3766rem + 1.2987vw), var(--maxFontSizeReg) ); }

Actual result after minifying:

body{--fontSize:clamp(var(--fontSizeReg),calc(0.3766rem+1.2987vw),var(--maxFontSizeReg));}

Expected result after minifying:

body{--fontSize:clamp(var(--fontSizeReg),calc(0.3766rem + 1.2987vw),var(--maxFontSizeReg));}

Note the required missing spaces around the plus sign in the actual result.