var element = document.getElementById("not-target");
var get_element = getComputedStyle(element);
console.log(get_element);
<html>
<body>
<div id="div1">
<div id="not-target" style="background-color: red;">
1111111111111111111111111111111111
</div>
<div>
<div id="target" style="background-color: blue;">
2222222222222222222222222222222222222222222
</div>
</body>
<script src="script2.js"></script>
</html>
CSS2Properties(328) { "align-content" → "normal", "align-items" → "normal", "align-self" → "auto", "animation-delay" → "0s", "animation-direction" → "normal", "animation-duration" → "0s", "animation-fill-mode" → "none", "animation-iteration-count" → "1", "animation-name" → "none", "animation-play-state" → "running", … }
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