Modifying HTML Content and Attributes

element.style.backgroundColor = 'red';
element.setAttribute('style', 'background-color: red;');

Always use setAttribute
Always use style property
Using the style property is the recommended way to set inline styles. It provides better type checking, auto-completion in IDEs, and is more maintainable. The style property uses camelCase names (backgroundColor instead of background-color) and provides direct access to individual CSS properties. While setAttribute works, it requires string manipulation and doesn't provide any validation or typing support. Additionally, the style property allows you to modify individual properties without affecting others.
Use style for single properties, setAttribute for multiple
They are interchangeable