CSS Interview Questions

28 Questions
HTML & CSS

HTML & CSS

Web DevelopmentFrontend

Question 3

How do you apply a style to an element using an ID selector?

Answer:

To apply a style to an element using an ID selector in CSS, you need to follow these steps:

1. Assign an ID to the HTML Element

First, assign a unique id attribute to the HTML element you want to style. The id should be unique within the document.

<p id="myParagraph">This is a paragraph.</p>

2. Create a CSS Rule with an ID Selector

In your CSS, create a rule that uses the ID selector to target the specific element. The ID selector is created by prefixing the ID value with a # symbol.

#myParagraph {
    color: blue;
    font-size: 16px;
    font-weight: bold;
}

3. Apply the CSS

The styles defined in the CSS rule will be applied to the element with the matching ID.

Example: Full HTML Document with an ID Selector

Here's how it looks when put together in an HTML document:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>ID Selector Example</title>
    <style>
        /* ID selector */
        #myParagraph {
            color: blue;
            font-size: 16px;
            font-weight: bold;
        }
    </style>
</head>
<body>
    <!-- The paragraph with the ID "myParagraph" will be styled according to the CSS rule above -->
    <p id="myParagraph">This is a paragraph.</p>
</body>
</html>

Key Points

  • The id attribute in HTML must be unique within a document. You should not assign the same ID to multiple elements.
  • The ID selector in CSS is case-sensitive, meaning #myParagraph is different from #myparagraph.
  • The ID selector has a higher specificity than class selectors and element selectors, which means it will override styles applied by those selectors if there is a conflict.

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