What is the correct XHTML syntax for setting a checkbox as checked?

To set a checkbox as checked in XHTML, you can use the "checked" attribute within the input tag. This attribute does not require a value, simply including it in the tag will mark the checkbox as checked. This is useful when you want to pre-select certain options in a form for the user. ```html <input type="checkbox" name="example" value="1" checked /> Example Checkbox ```