Modifying CSS styles in real-time according to the present data

Is there a way to dynamically change CSS values based on current CSS values?

For example, instead of explicitly setting different values like this:

.test{
    margin-top:100px;
}
.test:hover{
    margin-top:90px;
}

Is it possible to achieve the same effect with something like this?

.test{
    margin-top:100px;
}
.test:hover{
    margin-top:(-10px);
}

Thank you in advance for clarifying. I hope my question is clear.

By the way, I am not interested in a JavaScript solution as I already know how to do that. I am simply curious if this can be accomplished using only CSS.

Answer №1

Unfortunately, CSS alone cannot achieve this task as it lacks the dynamic capabilities required.

However, once CSS variables become available, similar functionalities may be possible.

Consider the following example:

2.3 Resolving Dependency Cycles - Example 8

<one><two><three /></two></one>
one   { var-foo: 10px; }
two   { var-bar: calc(var(foo) + 10px); }
three { var-foo: calc(var(bar) + 10px); }

In the meantime, alternatives such as LESS or SASS can be explored.

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