let height = Math.floor((Math.random()*100)+50);
document.getElementById("child").style.cssText="background-color: red; height: " + height + "px; width: 100px;";
let height = Math.floor((Math.random()*100)+50);
document.getElementById("child").style.cssText="background-color: red; height: " + height + "px; width: 100px;";
To achieve the desired result, you can use string concatenation or Template literals. Additionally, ensure that the element has the style attribute set to display:block;
String Concatenation Example
var randomHeight = Math.floor((Math.random()*100)+50);
document.getElementById("child").style.cssText="display:block;background-color:red; height:"+randomHeight+"px; width:100px;";<span id="child">ABC</span>Template literals Example
var randomHeight = Math.floor((Math.random()*100)+50);
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