This example shows a screen-filling SVG animation of thin vertical lines that pulse outward into thicker bars over time. A circular mask reveals the animation at the center, with the mask radius itself expanding and contracting rhythmically. The code generates lines with a gradient color scheme based on their horizontal position, skipping every third line, and animates a subset of lines using SVG’s native `<animate>` element. The visualization uses raw JavaScript and the SVG DOM API, with no external libraries.