An example of this is a button that adds a border on hover through CSS. When it's hovered over, the button jumps around, I assume because the border adds to its width and height. In javafx 2.2, this didn't happen.

My workaround is to add a transparent border of the same width on the non-hovered mode. Here is the CSS I'm using:

.toolbarButton {
    -fx-font-family: 'FontAwesome';
    -fx-font-size: 1.1em;
    -fx-padding: 3 5 1 5;
    -fx-background-color: transparent;
    -fx-focus-traversable: false;
    -fx-text-fill: ladder(-fx-background, white 49%, black 50%);
    -fx-graphic-text-gap: 0;
}

.toolbarButton:hover {
    -fx-border-color: -fx-text-fill;
    -fx-border-style: solid;
    -fx-border-width: 1;
    -fx-border-radius: 3;
}