CodePen Embed - Mastering margin collapsing

<div class="foo">foo</div>
<div class="bar">bar</div>

        div {
            width: 100px;
            height: 100px;
            margin: 100px;
        }
        
        .foo {
            background: skyblue;
        }
        
        .bar {
            background: palevioletred;
        }

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