A walkthrough of building a callout UI element (with leader line and text box) using CSS offset-path, borders, and transforms. The technique uses offset-path: border-box and offset-anchor to attach the text box to the callout's border, so it moves with any border changes. Variations include slanted lines via skewX, multi-layered box-shadows for colored leader lines, corner-shape for notched corners, and CSS animations to reveal the callout on hover.
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