What is the purpose of using multiple css classes together?

In my project, I have implemented CSS modules which allow me to use multiple classes.

The variable open is a boolean that determines whether or not the Paper should shift.

<Paper className={`${classes.paper} ${open && classes.paperShift}`}>

Question: Why are we using multiple classes, and how do they affect the rendering of elements?

As a reference, I checked out this discussion: using css modules how do I define more than one style name

Answer №1

When it comes to CSS classes, the browser combines all the rules of each class and applies them to the element. In case of conflicting rules, the browser will determine which one takes precedence - understanding CSS in depth can give you insight into this process.

By using multiple classes, you can apply different styles to an element simultaneously. This allows for more flexibility in visual design and reusability of rules by splitting them into different classes.

Furthermore, classes assigned to an element can also be utilized by JavaScript code to target specific elements or groups of elements for performing actions or extracting information from them.

Answer №2

These are HTML classes, not CSS classes.

Essentially, it indicates that the element belongs to multiple classes.

Any reference made by CSS, JS, or any other language using either of these classes will locate the element. And likewise, a reference using both classes will also find the element.

console.log(Array.from(document.querySelectorAll('.one')));
console.log(Array.from(document.querySelectorAll('.two')));
console.log(Array.from(document.querySelectorAll('.one.two')));
.one {
  font-family: monospace;
  font-size: 1.5em;
}

.two {
  background: yellow;
}
<div class="one">one</div>
<div class="two">two</div>
<div class="one two">one two</div>

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