javascript add id to element with class

sure! in javascript, you can add an `id` attribute to an element with a specific class by first selecting the element using its class name, and then setting the `id` attribute on that element.

here's a step-by-step guide with a code example:

2. **set the `id` attribute**: once you have selected the element, you can set the `id` attribute using the `setattribute()` method.

3. **code example**:

in this example, we have a `div` element with the class name `return-element`. the javascript code selects this element, adds the `id` attribute with the value `new-id`, and logs a message confirming that the `id` has been added.

you can run this code in an html file in your browser to see how the `id` attribute is added to the element with the specified class.

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