About Lesson
JavaScript Can Change HTML Content
One of many JavaScript HTML methods is getElementById().
This example uses the method to “find” an HTML element (with id=”demo”) and changes the element content (innerHTML) to “Hello JavaScript”:
document.getElementById(“demo”).innerHTML = “Hello JavaScript”;
JavaScript Can Change HTML Attribute Values
In this example JavaScript changes the value of the src (source) attribute of an <img> tag:
JavaScript Can Change HTML Styles (CSS)
Changing the style of an HTML element, is a variant of changing an HTML attribute:
document.getElementById(“demo”).style.fontSize=“35px”;
- Commonly Asked Questions
- How do I get JavaScript?
- Where can I download JavaScript?
- Is JavaScript Free?
- You don’t have to get or download JavaScript.
JavaScript is already running in your browser on your computer, on your tablet, and on your smart-phone. Free to use for everyone.