Template:Sandbox/erfxploded-test.css

.spoiler-blur {
    filter: blur(3px);
    opacity: 0.2;
    transition-property: filter, opacity;
    transition-duration: .4s;
}

.spoiler-blur:hover, .spoiler-blur:focus {
    filter: none;
    opacity: 1;
}

/* The following are the new blur classes. */
.spoiler-blur-hoverable:hover, .spoiler-blur-hoverable:focus {
    filter: none;
    opacity: 1;
}

.spoiler-blur-link {
    filter: blur(3.5px);
    opacity: 1.0;
    transition-property: filter, opacity;
    transition-duration: .1s;
}

.spoiler-blur-paragraph {
    filter: blur(3px);
    opacity: 0.2;
    transition-property: filter, opacity;
    transition-duration: .4s;
}

.spoiler-blur-image {
    filter: contrast(5%) blur(3px);
    opacity: 0.5;
    transition-property: filter, opacity;
    transition-duration: .4s;
}