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  • \$\begingroup\$ 149: f=c=>eval(((document.body.innerHTML=`<font id=g color=${c}>`),getComputedStyle(g).color));rgb=(...a)=>a.map(n=>(n+256).toString(16).slice(1)).join`` \$\endgroup\$ Commented Aug 1, 2022 at 12:54
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    \$\begingroup\$ Shouldn't this be 'HTML+Javascript', since you need a DOM environment for execution? \$\endgroup\$ Commented Aug 1, 2022 at 14:43
  • \$\begingroup\$ You can do this in HTML in 74 bytes, output letter X in the actual color: <font>X<input oninput=this.parentElement.setAttribute('color',this.value) \$\endgroup\$ Commented Aug 1, 2022 at 15:18
  • \$\begingroup\$ @ccprog the goal is to output an hex string, not to set an element's color. (And you could outgolf your HTML: onevent attributes use the target as context, so this is never needed there, but setting an id on the parent makes it available as a global, so you could shave 17 bytes if I count correctly <font id=f>X<input oninput=f.setAttribute('color',value) (untested, I'm on a phone, but that doesn't answer the question anyway) (Oh and since you don't read it I don't think you need setAttribute, .color should work, if I'm not mistaken). \$\endgroup\$ Commented Aug 1, 2022 at 15:43
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    \$\begingroup\$ @Kaiido quote: "Output any representation of the resulting RGB color (including but not limited to the actual color". Otherwise, you are right: <font id=f>X<input oninput=f.color=value works just fine with 41 bytes. \$\endgroup\$ Commented Aug 1, 2022 at 16:04