Question

Can I have a css tag on my page, that is applied selectively to some div element on that page only.

Say it has some entry like

    * {
    margin: 0;
}

I do not want this property to be applied on all the elements on that page.

Answer 1

You must assign id to the divs you want to apply css individually and seperately.
and you must assign class to a set of elements if you want to apply some css to that set collectively.

It will not apply on all elements in that page.

ID method:

#div{
margin: 0;
}

Class method:

.div{
margin: 50;
}

HTML:

<div id="div"> </div>
<div class="test"> </div>
<div class="test"> </div>
<div class="test"> </div>