Detecting Scroll State with CSS

Modern CSS allows us to detect scroll behavior and apply styles without using JavaScript. In this example, we check whether the .container element is scrollable. By using @keyframes and animation-timeline, we track the scroll state.

If the element is scrollable, the background turns green #008000; otherwise, it turns red #FF0000.

/* Keyframes animation to detect scroll status */
@keyframes detectScroll {
  from,
  to {
    --scroll-status: /* A custom variable to check the scroll status */
  }
}

.container {
  /* Apply scroll animation */
  animation: detectScroll linear;
  animation-timeline: scroll(self); /* Bind the animation to the container's scroll behavior */

  /* Define background color based on scroll status */
  --bg-scrollable: var(--scroll-status) #008000; /* Green if scrollable */
  --bg-scrollable-hide: #FF0000; /* Red if not scrollable */
  background-color: var(--bg-scrollable, var(--bg-scrollable-hide)); /* Set the background color */
}

This method provides a simple and efficient way to give users visual feedback. CSS is now capable of handling interactions like scrolling!

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