Once you can select an element from the DOM, the next step is to change its content and appearance.
JavaScript allows you to update text, HTML, and styles dynamically. This is what makes websites interactive — messages change, colors update, and layouts respond to user actions.
Learning how to change content and styles is a key step in building modern web applications.
What You Can Change Using JavaScript
- Text inside elements
- HTML content
- Colors and fonts
- Size and layout
- Visibility of elements
These changes happen instantly without reloading the page.
The textContent property changes the text inside an element.
This is commonly used to show messages, alerts, and dynamic updates.
The innerHTML property changes the HTML inside an element.
This allows you to add formatting, links, and even new elements dynamically.
This example shows how JavaScript can change the look of a web page using styles.
By mastering how to change content and styles, students gain the power to build dynamic, interactive, and professional front-end applications.