javascript add class to element by id

adding a class to an element in javascript is a common task when working with the document object model (dom). this task can be achieved by selecting the element using its id and then adding a class to it using the `classlist` property.

here's a step-by-step tutorial on how to add a class to an element by id in javascript:

1. **select the element by id:**


2. **add a class to the element:**


3. **check if the class was added:**
you can also check if the class was successfully added to the element by logging the element's `classname` property. this property returns a string of the element's classes. for example:


here's a complete code example that demonstrates adding a class to an element with a specific id:

by following these steps, you can easily add a class to an element by its id in javascript.

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