Can you identify the type of CSS selector being used here and explain its significance?

When delving into learning about bootstrap, I stumbled upon this code snippet:

.control-group.error input, [...] {
   [...]
}

At first glance, it appears to be a descendant selector, but .control-group.error is actually a class.

I searched extensively and came up empty-handed:

Can someone offer me some guidance?

Answer №1

If I have grasped your query correctly, using the selector .control-group.error will target elements that possess both the class names control-group and error.

As you mentioned, selecting input targets any input element within an element carrying the classes control-group and error.

For instance, it would select:

<form class="control-group error">
    <input> <!-- It selects this (both classes on form) -->
</form>

However, it wouldn't select:

<form class="control-group">
    <input> <!-- It doesn't select this (only one class on form) -->
</form>

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