what does html > signify in CSS?

Question

I have below CSS code in some CSS file of Liferay portal.

What does html > signify? When that should be used?

.lfr-dockbar-pinned {
    .dockbar {
        left: 0;
        position: fixed;
        right: 0;
        top: 0;
    }

    .pin-dockbar img {
        background-image: url(../images/dockbar/unpin.png);
    }
}

html > .lfr-dockbar-pinned {
    padding-top: 3.45em;
}

Answer 1

An element with the class lfr-dockbar-pinned that is a direct child descendant of the html element. See: http://www.w3.org/TR/CSS2/selector.html#child-selectors