A beginner-focused walkthrough of common DOM manipulation mistakes in JavaScript, drawn from personal experience. Covers seven pitfalls: selecting wrong elements, running scripts before HTML loads, forgetting event listeners, misusing innerHTML, confusing querySelector vs querySelectorAll, overusing inline style changes instead of CSS classes, and making too many DOM updates that hurt performance.
Table of contents
“Why is my button not working?”“Why is text not changing?”“Why is JavaScript not updating the page?”What is DOM Manipulation?Document Object Model1. Forgetting to Select the Correct Elementeven small spelling mistakes break DOM selection.2. Running JavaScript Before HTML Loads3. Forgetting Event ListenersGet TechByKDN’s stories in your inbox4. Using innerHTML Incorrectly5. Confusing querySelector and querySelectorAll6. Changing Styles Directly Too Muchadding or removing CSS classes is cleaner.7. Forgetting That DOM Manipulation Can Be Slowunnecessary DOM updates can reduce performance.Biggest Thing I LearnedDOM manipulation becomes easier with practice.1.9K Impressions