Accessibility / Zoom / 400 Percent Zoom Stress Test Bookmarklet

The 400% Zoom Stress Test bookmarklet simulates a 320px viewport at 400% zoom to test WCAG reflow requirements. Wraps all page content in a container with `transform: scale(4)` and `width: 320px`, enables scrolling on the document element, and after a brief delay, checks for horizontal scrolling and overlapping content blocks (using bounding box intersection). Displays an alert with horizontal scroll status and overlap count. Run again to remove.

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