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Last edited Dec 30, 2022

Created on Dec 30, 2022

This example uses an SVG mask to reveal a series of horizontal lines through a circular hole. It creates a white mask rectangle covering the entire viewport, with a black circle in the center. One hundred semi-transparent vertical strips are then drawn over the full SVG width, each clipped by the mask. The code manually builds the SVG elements using the DOM API and the `d3` library’s `selection` object, setting the mask’s dimensions to match the window size.

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A bare minimum HTML page demonstrating use of CSS and JavaScript.

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