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Last edited Jan 20, 2023

Created on Jan 19, 2023

This example creates an SVG mask that reveals horizontal stripes through a circular window. The code generates 100 horizontal rectangles, each masked by a circle centered on the screen, while 100 vertical rectangles overlay the full canvas without masking. All shapes are built dynamically using the SVG namespace with `document.createElementNS`, and the mask is defined with a black background rect and white circle to control visibility. The result is a simple geometric pattern combining masked and unmasked grid-like elements.

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

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