Preventing “double” borders in CSS

Question

Say I have two divs next to each other (take https://chrome.google.com/webstore/category/home as reference) with a border.

Is there a way (preferably a CSS trick) to

Answer 1

Another solution one might consider is using the CSS Adjacent sibling selector.

The CSS

div {
    border: 1px solid black;
}

div + div {
    border-left: 0;
}

jsFiddle