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When you put CSS classes next to each other without any space between them, it's a way of selecting elements that have both of those classes. This is known as a compound or concatenated class selector.
For example, consider the following HTML:
<div class="class1 class2">Hello, World!</div>
In this case, the element <div>
has both the "class1" and "class2" classes. To style this element in CSS, you can use a compound class selector:
.class1.class2 { /* CSS styles go here */ color: red; font-size: 16px; }
This CSS rule will only apply to elements that have both "class1" and "class2" classes. It's a way of making the selector more specific, targeting only the elements that meet both criteria. If an element has only one of the classes or none of them, the styles within the compound class selector will not apply.
This specificity is useful in situations where you want to be more precise in selecting certain elements for styling without affecting other elements that may have only one of the classes.
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