Question

Ive been wondering… in CSS are there any differences between creating a style class and applying it an element, or creating a style with the #elementId notation (apart from being able to assign a class to different elements)?

For example…

#div1
{
 background-color: Yellow;
}

<div id="div1">
    Hello world!
</div>

Or

.div1
{
 background-color: Yellow;
}

<div class="div1">
    Hello world!
</div>

Thanks! 🙂

Answer 1

An ID must be unique in a document. Classes can be used in any number and combination. So you can use one class on multiple elements and multiple classes on one element.