A JavaScript Set is a collection of unique values. For each element type, you can use specific attribute to set value. To set all array elements to a specific value in JavaScript, you can use any of these methods Use the fill () method to fill all array elements with the value you want. This example sets the value of the elements in an XML document. Set the Value of a Select Element using JavaScript # Use the value property to set the value of a select element, e.g. 3. The specialty of set object is that are contains a collection of unique (duplicate) element. set attribute value of input javascript. Try moving the contents of the