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[tmrr13]

Convert Alpine.js parallax text effect to vanilla JS using Intersection and Mutation Observers for class-based application.

The original request was to refactor an Alpine.js example to pure JS, allowing users to apply the parallax effect simply by adding a class to a text block. This implementation uses IntersectionObserver to manage the requestAnimationFrame loop efficiently and MutationObserver to handle dynamically added/removed elements or class changes.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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