Not to be confused with stylesheet style-rule CSSRule.cssText.
cssText returns or sets the text of the element's inline style declaration only. To be able to set a stylesheet rule dynamically, see Using dynamic styling information.
string = elem.style.cssText
<span id="s1" style="color: red;">
Some text
</span>
<script>
var elem = document.getElementById("s1");
alert(elem.style.cssText); // { color: red; }
</script>
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https://developer.mozilla.org/en-US/docs/Web/API/CSSStyleDeclaration/cssText