JavaScript HTML DOM - Changing CSS - W3Schools

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Changing HTML Style

The HTML DOM allows JavaScript to change the style of HTML elements.

To change the style of an HTML element, use this syntax:

document.getElementById(id).style.property= new style

Example

Changes the style of a <p> element:

<html> <body> <p id="p2">Hello World!</p> <script> document.getElementById("p2").style.color = "blue"; </script> </body> </html> Try it Yourself »

Using Events

The HTML DOM allows you to execute code when an event occurs.

Events are generated by the browser when "things happen" to HTML elements:

  • An element is clicked on
  • The page has loaded
  • Input fields are changed

You will learn more about events in the next chapter of this tutorial.

Example

Change the style of the HTML element with id="id1", when the user clicks a button:

<!DOCTYPE html><html><body><h1 id="id1">My Heading 1</h1> <button type="button" onclick="document.getElementById('id1').style.color = 'red'"> Click Me!</button></body></html> Try it Yourself »

More Examples

Example

How to make an element invisible. Do you want to show the element or not?

<input type="button" value="Hide text" onclick="document.getElementById('p1').style.visibility='hidden'"> <input type="button" value="Show text" onclick="document.getElementById('p1').style.visibility='visible'"> Click Me!</button> </body> </html> Try it Yourself »

HTML DOM Style Object Reference

For all HTML DOM style properties, look at our complete HTML DOM Style Object Reference.

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