How to create a partial border(with a hole)?

Question

I wrote code in JavaFX and used CSS for setting styles for the above issue. The following code made borders for an AnchorPane that are 2 pixels wide:

    AnchorP         


        

Answer 1

how about use :before ?

.testbox is a block element that you want to add the border.

.testbox{
    margin:10px;
    border:#000 solid 2px;
}

.testbox:before {
    background: #fff;
    width:300px;
    height: 2px;
    content: '';
    position: relative;
    display: block;
    top: 0;
    left: 300px;
    margin: -2px 0 0;
}