Here are a few question-based titles that fit your article content: * Double Borders in CSS: How to Avoid the Unwanted Effect? * CSS Layout Issues: Dealing with Double Borders Between Adjacent Divs *

Avoiding Double Borders in CSS

When adjacent divs with borders are placed side by side, they can create an undesirable double border effect at their intersection. This can be particularly disconcerting in layouts like that of the Chrome web store homepage.

To address this issue, consider the following CSS tricks:

Outline Trick

By applying an outline instead of a border to the child elements (divs) and adjusting their margins accordingly, you can achieve the desired effect:

.collection {
    /* optional styles */
    margin-top: -1px;
    margin-left: -1px;
}

.collection .child {
    outline: 1px solid;
    margin-top: 1px;
    margin-left: 1px;
}

Note that outline is not supported by browsers older than IE8.

Border and Negative Margin Trick

Another option is to use borders on the child elements and apply negative margins to counteract the border widths:

.collection .child {
    margin-top: -1px;
    margin-left: -1px;
}

Either of these methods effectively prevents the double border appearance by overlapping or offsetting the borders. The choice of technique may depend on browser support and specific project requirements.

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