CSS overflow: clip fixes clipping bug inside fixed-position overlays

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A developer building a fullscreen navigation overlay for a Next.js 15 portfolio site encountered a persistent CSS bug where split-text hover animations displayed both text layers simultaneously. Multiple attempts using overflow: hidden, fixed pixel heights, clip-path, and inline styles all failed to clip the overlapping layers. The root cause turned out to be a CSS specification rule: overflow: hidden creates a Block Formatting Context, which cannot function correctly when the element is a descendant of a position: fixed ancestor. Since the navbar overlay used position: fixed, the browser silently skipped clipping without throwing any errors, making the bug difficult to diagnose. Replacing overflow: hidden with overflow: clip — a newer CSS property that clips content without creating a Block Formatting Context — resolved the issue across Chrome, Firefox, and Safari.

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