Toggle dark mode and see how the icon below adapts to the currentColor:

<svg xmlns="http://www.w3.org/2000/svg"    
    viewbox="0 0 24 24" fill="none"
    stroke="currentColor" stroke-width="2"
    stroke-linecap="round" stroke-linejoin="round"
>
  <circle cx="12" cy="12" r="10"/>
  <circle cx="12" cy="12" r="4"/>
  <line x1="21.17" y1="8" x2="12" y2="8"/>
  <line x1="3.95" y1="6.06" x2="8.54" y2="14"/>
  <line x1="10.88" y1="21.94" x2="15.46" y2="14"/>
</svg>        
    

This also works for externally referenced SVGs:

<svg>
  <use href="chrome.svg#chrome"></use>
</svg>