Is it not possible to store the sum using getBoundingClientRect into a variable?

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Yes, it is possible to store the sum using getBoundingClientRect into a variable. Here is an example code:

const element = document.getElementById('myElement');
const rect = element.getBoundingClientRect();

const sum = rect.top + rect.left + rect.width + rect.height;
console.log(sum); // prints the sum of top, left, width, and height

In this example, we retrieve the bounding box of an element with the ID "myElement" using getBoundingClientRect(). We then store the four properties of this bounding box (top, left, width, and height) into separate variables. Finally, we add these four variables together and store the result in a variable called "sum".