title: SVG circle stroke opacity
body: <p>Is it possible to make the circle's stroke opacity, and not having that inner circle?
  Like this:</p>
  <p><a href="https://i.stack.imgur.com/E6E3z.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/E6E3z.png" alt="enter image description here" /></a></p>
  <p>I can only do like this so far:
  <div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-css lang-css prettyprint-override"><code>svg {
    width: 200px;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;svg viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg"&gt;
    &lt;circle cx="50" cy="50" r="40" style="
      stroke-width: 10;
      stroke: purple;
      stroke-opacity: 0.5;
      fill: green;
  "&gt;&lt;/circle&gt;
  &lt;/svg&gt;</code></pre>
  </div>
  </div>
  </p>