W3.JS Add Style

Add a CSS property value

Add Style by Id

Add a red background color to an element with id="London":

<button onclick="w3.addStyle('#London','background-color','red')">Add Style</button>

Add a red background color to all <h2> elements:

<button onclick="w3.addStyle('h2','background-color','red')">Add Style</button>

Add a red background color to all elements with class="city":

<button onclick="w3.addStyle('.city','background-color','red')">Add Style</button>

Email:

Content: