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Nick Jones

CTO, Software Engineer, Indie Hacker

CSS Boolean Selectors

Just a short one.

Have you been in the situation where you’d like to be able to enable a style only when both classes are defined for an element? For example:

    <li class="level-0">Home</li>
    <li class="level-0">Electronics</li>
    <li class="level-1">Televisual Boxes</li>
    <li class="level-1 over">Kettles</li>
    <li class="level-0">Furniture</li>
    <li class="level-0">Clearance</li>

We’ll ignore the fact that we could have used the :hover pseudo-class, and that we could have used an additional <ul></ul> to define the level-1 items.

Logical AND (&&) We can invoke a specific over CSS class on only the level-1 items with the following:

li.level-1.over {
    background-color: red;

Keeping adding additional class by chaining with the .className syntax.

Logical OR (||) Of course, to OR the classes you simply comma-separate them:

li.class1, li.class2 {
    background-color: green;