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DOM Manipulation Methods:
1. getElementById(): Returns element by ID.
2. getElementsByClassName(): Returns elements by class.
3. getElementsByTagName(): Returns elements by tag.
4. querySelector(): Returns first element matching CSS selector.
5. querySelectorAll(): Returns all elements matching CSS selector.
6. createElement(): Creates new element.
7. appendChild(): Appends child to parent.
8. insertBefore(): Inserts child before reference node.
9. removeChild(): Removes child from DOM.
10. replaceChild(): Replaces child with another.
11. setAttribute(): Sets attribute.
12. getAttribute(): Gets attribute value.
13. removeAttribute(): Removes attribute.
14. textContent: Sets/gets text content.
15. innerHTML: Sets/gets HTML content.
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