Css Id Selector

CSS id selector

Created By: chatGPT

CSS IDs are unique identifiers used to style individual elements on a web page. An ID begins with the # symbol followed by the name of the ID. It's important to note that each ID must be unique within a single HTML document, meaning no two elements can share the same ID. This allows for precise targeting of elements to apply specific styles.

/* Example of using an ID selector in CSS */
#header {
    background-color: blue;
    color: white;
    padding: 10px;
    text-align: center;
}

To use an ID selector, you first define an ID in your HTML element. For example, if you have a <div> with the ID header, you can then reference it in your CSS by using the # symbol. Remember only one element should have this ID to maintain its uniqueness.

<div id="header">Welcome to My Website</div>

You can combine ID selectors with other selectors for more complex styling rules. Consider using class selectors or tag selectors in conjunction with ID selectors to create more specific styles.

#header h1 {
    font-size: 24px;
    font-weight: bold;
    margin: 0;
}

In JavaScript, you can also easily manipulate elements with a specific ID. The getElementById method allows you to quickly access and alter elements by their ID, proving the versatility of using IDs in both CSS and JavaScript.

const header = document.getElementById('header');
header.style.backgroundColor = 'red';