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JavaScript object can be used to modify element.style by using the following syntax:

1. Get the DOM element you want to modify:

var myElement = document.getElementById("my-element");

1. Access the style object of the element:

var elementStyle = myElement.style;

1. Set the properties and values you want to modify:

elementStyle.backgroundColor = "red";
elementStyle.fontSize = "20px";

Here is a full example:

var myElement = document.getElementById("my-element");
var elementStyle = myElement.style;

elementStyle.backgroundColor = "red";
elementStyle.fontSize = "20px";

This will set the background color of the element to red and the font size to 20 pixels.