A walkthrough of using CSS `mask-image` with inline SVG masks to create puzzle piece shapes on DOM elements. Covers SVG shape construction using `<rect>` and `<circle>` elements, how mask colors (white = visible, black = hidden) control visibility, referencing masks by ID in CSS, and the critical `maskContentUnits="objectBoundingBox"` attribute needed to map mask coordinates correctly to target elements.
Table of contents
The SVG shapesThe SVG masksMasks colorsMask IDsMask coordinatesApplying the mask to DOM elements with CSS maskingSort: