I remember there was a crutch in css that took away its distance from the border, what is it?

Question

css

Back in those days when they just switched from tabular to block layout and made a sitebar, it was all based on float and fixed width. And if they added a border, everything broke. I now have a very similar problem, it is necessary that the border does not occupy the height in the block, there was either a similar property or something else ... I can’t remember

Answer 1

.test {
    height: 20px;
    border: 1px solid #000;
    box-sizing: border-box;
}