What does the 'backdrop-filter' property do in CSS?

The backdrop-filter property in CSS applies a graphical effect such as blurring or color shifting to the area behind an element. This allows you to create a frosted glass effect or other visual styles that enhance the design of your web page.

Here’s a simple example of how to use the backdrop-filter property:

.frosted-glass {
    background: rgba(255, 255, 255, 0.5); /* Semi-transparent background */
    backdrop-filter: blur(10px); /* Apply a blur effect to the background */
    border-radius: 10px; /* Rounded corners */
    padding: 20px; /* Padding inside the element */
}

In this example, the element with the class frosted-glass will have a semi-transparent white background and a blur effect applied to whatever is behind it, creating a frosted glass appearance.