Type "n" in a Chrome Extension text field and Instagram suddenly opens a panel. That is no coincidence. A look at event bubbling, document-level listeners and why stopPropagation() in the right place solves it.
Instagram lazy-loads carousel slides. Only the first two are in the DOM when a post opens. A MutationObserver and a while loop automatically extract every slide without touching a single class name.
Instagram uses article tags in the feed, but not in the profile grid. Ancestor traversal fixes incorrect PostIds, while a promise map prevents duplicate backend requests.
Instagram truncates captions and changes class names with every deployment. Semantic DOM searches and a MutationObserver still load the full text reliably.
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