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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>getComputedStyle() — vs inline</title>
</head>
<body>
  <h1>vs element.style</h1>
  <div id="box" style="color:navy;padding:8px">Hello</div>
  <button type="button" id="btn">Compare</button>
  <pre id="out">Waiting...</pre>
  <script>
    document.getElementById("btn").onclick = function () {
      var el = document.getElementById("box");
      document.getElementById("out").textContent =
        "inline: " + el.style.color + "\n" +
        "computed: " + getComputedStyle(el).color;
    };
  </script>
</body>
</html>

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JavaScript getComputedStyle() — vs element.style (Try It)