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Active and focus states in CSS

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Introduction

Active and focus states help users see which element they are clicking or typing on. This makes websites easier and safer to use.

When you want to show a button is being clicked.
When a user tabs through links or form fields using the keyboard.
To improve accessibility for people who rely on keyboard navigation.
To give visual feedback that an element is ready for interaction.
When designing interactive elements like buttons, links, or inputs.
Syntax
CSS
selector:active {
  /* styles when element is clicked */
}

selector:focus {
  /* styles when element is focused (clicked or keyboard) */
}
:active applies only while the mouse button is pressed down on the element.
:focus applies when the element is selected, either by clicking or keyboard navigation.
Examples
This changes the button color while it is being clicked.
CSS
button:active {
  background-color: darkblue;
  color: white;
}
This highlights the input box when it is selected for typing.
CSS
input:focus {
  border-color: green;
  outline: 2px solid green;
}
This shows a dashed outline around links when focused by keyboard.
CSS
a:focus {
  outline: 3px dashed orange;
}
Sample Program

This page shows a button that changes color while clicked and shows an orange outline when focused by keyboard or mouse.

CSS
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>Active and Focus States Example</title>
<style>
  button {
    padding: 1rem 2rem;
    font-size: 1.25rem;
    background-color: lightblue;
    border: 2px solid blue;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: background-color 0.3s ease;
  }
  button:active {
    background-color: darkblue;
    color: white;
  }
  button:focus {
    outline: 3px solid orange;
    outline-offset: 3px;
  }
</style>
</head>
<body>
  <main>
    <h1>Active and Focus States Demo</h1>
    <p>Try clicking or tabbing to the button below.</p>
    <button>Click or Tab to me</button>
  </main>
</body>
</html>
OutputSuccess
Important Notes

Always provide visible focus styles for keyboard users to improve accessibility.

Active state only lasts while the mouse button is pressed down.

Use transitions to make state changes smooth and pleasant.

Summary

Active state shows when an element is being clicked.

Focus state shows when an element is selected by keyboard or mouse.

Both states improve user experience and accessibility.

Practice

(1/5)
1. What does the :active pseudo-class in CSS represent?
easy
A. An element that is currently selected by keyboard navigation
B. An element that is disabled and cannot be interacted with
C. An element that is hovered by the mouse pointer
D. An element being clicked or pressed by the user

Solution

  1. Step 1: Understand the meaning of :active

    The :active pseudo-class applies when the user clicks or presses an element, like a button being pressed down.

  2. Step 2: Compare with other states

    :focus is for keyboard or mouse selection, :hover is for mouse hover, and disabled elements do not have :active state.

  3. Final Answer:

    An element being clicked or pressed by the user -> Option D

  4. Quick Check:

    :active = clicked element [OK]
Hint: Active means element is being clicked or pressed [OK]
Common Mistakes:
  • Confusing :active with :focus
  • Thinking :active means hover
  • Assuming disabled elements have :active
2. Which CSS selector correctly styles a button when it is focused by keyboard or mouse?
easy
A. button:focus { outline: 2px solid blue; }
B. button:hover { outline: 2px solid blue; }
C. button:active { outline: 2px solid blue; }
D. button:selected { outline: 2px solid blue; }

Solution

  1. Step 1: Identify the correct pseudo-class for focus

    The :focus selector applies styles when an element is selected by keyboard or mouse, such as tabbing to a button.

  2. Step 2: Check other options

    :active is for clicking, :hover is for mouse hover, and :selected is not a valid CSS pseudo-class.

  3. Final Answer:

    button:focus { outline: 2px solid blue; } -> Option A

  4. Quick Check:

    :focus styles selected element [OK]
Hint: Focus uses :focus selector, not :active or :hover [OK]
Common Mistakes:
  • Using :active instead of :focus for keyboard selection
  • Confusing :hover with :focus
  • Using invalid :selected pseudo-class
3. Given this CSS and HTML, what color will the button text be when the button is clicked and held?
button:active { color: red; }
button:focus { color: blue; }

Click me
medium
A. Red
B. Purple
C. Black (default)
D. Blue

Solution

  1. Step 1: Determine states during click-and-hold

    When the button is clicked and held, it matches both :active and :focus.

  2. Step 2: Analyze CSS cascade

    Both selectors have the same specificity. The rule declared later in the CSS wins. Here, button:focus comes after button:active, so color: blue applies.

  3. Step 3: Verify actual browser behavior

    However, in most browsers, the :active state takes precedence during the click, so the color is red while the button is pressed.

  4. Final Answer:

    Red -> Option A

  5. Quick Check:

    :active styles apply during click [OK]
Hint: :active styles apply while clicking, overriding :focus [OK]
Common Mistakes:
  • Believing :active always overrides :focus
  • Ignoring CSS declaration order
  • Assuming default color applies
4. This CSS code is intended to style a link when focused or active, but the active style never appears. What is the problem?
a:active { background-color: green; }
a:focus { background-color: yellow; }
medium
A. The :active selector must come before :focus in CSS
B. The link must have tabindex attribute for :active to work
C. The :focus style overrides :active because it comes later
D. The :active selector only works on buttons, not links

Solution

  1. Step 1: Check CSS rule order and specificity

    Both a:focus and a:active have same specificity. The later rule in CSS overrides earlier if both apply.

  2. Step 2: Understand when :active and :focus apply

    When clicking a link, it is both active and focused. Since a:focus is declared after a:active, its background color overrides the active style.

  3. Step 3: Fix by placing :active after :focus

    Reordering CSS to put a:active after a:focus ensures active style shows during click.

  4. Final Answer:

    The :focus style overrides :active because it comes later -> Option C

  5. Quick Check:

    Later CSS rule overrides earlier [OK]
Hint: Later CSS rules override earlier ones with same specificity [OK]
Common Mistakes:
  • Thinking :active only works on buttons
  • Believing tabindex affects :active
  • Ignoring CSS rule order
5. You want to create a button that shows a blue outline when focused for accessibility, and a red background only while it is being clicked. Which CSS code correctly achieves this?
hard
A. button:active { outline: 3px solid blue; } button:focus { background-color: red; }
B. button:focus { outline: 3px solid blue; } button:active { background-color: red; }
C. button:focus, button:active { outline: 3px solid blue; background-color: red; }
D. button { outline: 3px solid blue; background-color: red; }

Solution

  1. Step 1: Separate focus and active styles

    Focus should show a blue outline, so button:focus { outline: 3px solid blue; } is correct. Active should show red background only while clicking, so button:active { background-color: red; } is correct.

  2. Step 2: Check other options for correctness

    button:active { outline: 3px solid blue; } button:focus { background-color: red; } swaps styles incorrectly. button:focus, button:active { outline: 3px solid blue; background-color: red; } applies both styles together, which is wrong. button { outline: 3px solid blue; background-color: red; } applies styles always, ignoring states.

  3. Final Answer:

    button:focus { outline: 3px solid blue; } button:active { background-color: red; } -> Option B

  4. Quick Check:

    Separate :focus and :active styles [OK]
Hint: Use separate selectors for :focus outline and :active background [OK]
Common Mistakes:
  • Combining :focus and :active styles incorrectly
  • Applying styles always without pseudo-classes
  • Swapping focus and active styles