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The @keyframes rule in CSS allows you to define intermediate steps in an animation sequence. By specifying keyframes, you control the style changes at various points throughout the animation. This is especially useful for creating smooth transitions and complex animations.

The pointer-events: none property in CSS disables any mouse interactions with an element, such as clicks or hover effects. When applied, it makes the element non-interactive, meaning it will not respond to any pointer events, even though it remains visible in the layout. This property is useful when you want to display elements that shouldn't interfere with user interactions, like in the case of overlay elements or inactive buttons. Example: button { pointer-events: none; } In this example, the button becomes non-interactive, meaning it can’t be clicked, even though it remains visible on the page.

To create an animated gradient background, CSS animations are used to transition between multiple gradient color states. This creates a dynamic effect where the colors gradually shift, enhancing the visual experience of the webpage without relying on images or heavy resources.

The place-content property in CSS combines both vertical and horizontal content alignment properties. It allows you to control how content is positioned within a container along both axes, simplifying the process of centering or adjusting content in grid or flexbox layouts without the need to set align-content and justify-content separately.

To handle broken images in CSS, you can define alternative content or a background for the image element when it fails to load. This ensures that instead of showing an empty or broken image link, a defined placeholder or a text notification is visible, maintaining the layout's integrity and providing a better user experience.