The cssText property of the CSSStyleDeclaration interface 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.
Not to be confused with stylesheet style-rule CSSRule.cssText.
A string containing the text of the element's inline style declaration.
<span id="s1" style="color: red;">Some text</span>const elem = document.getElementById("s1");
console.log(elem.style.cssText); // "color: red;"