What is the method for altering the formatting of an HTML element without an ID using a JavaScript function?

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One method for altering the formatting of an HTML element without an ID using a JavaScript function is to use a loop to iterate through all of the elements with the desired tag name and apply the necessary style changes to each one.

For example, if you wanted to change the background color of all

elements on a page using JavaScript, you could write a function like this:

function changePColor() {
  var paragraphs = document.getElementsByTagName("p");
  for (var i = 0; i < paragraphs.length; i++) {
    paragraphs[i].style.backgroundColor = "blue";
  }
}

This function first uses document.getElementsByTagName("p") to select all

elements on the page, and then loops through each one using a for loop. Inside the loop, it sets the backgroundColor style property of each element to "blue".

You could then call this function from an event listener, such as a button click, to apply the style changes to the

elements on the page.