The pseudo-class :nth-of-type(2) in CSS targets the second element of its type. It allows you to select and style the second occurrence of an element type within its parent container. This is useful for creating specific styles for the second element, such as the second paragraph or the second list item.

The text-transform property in CSS is used to control the capitalization of text. Setting it to "uppercase" transforms the text to all uppercase letters, while "lowercase" makes it all lowercase.

Media queries in CSS allow you to conditionally apply styles based on the width (or dimensions) of the device or browser window. By specifying different rules for various screen sizes, you can create responsive designs that adapt to different viewing environments.

To control how web fonts are displayed during the load process, you can adjust the font-display property in CSS. This property allows you to specify how the browser should handle font loading and rendering, with options like auto, swap, block, fallback, and optional. It helps you optimize the user experience when web fonts are slow to load or unavailable.

In CSS transitions, the transition-timing-function property controls the timing function for the transition. The ease-in-out option creates a smooth transition that starts slowly, accelerates in the middle, and slows down at the end. This is a common choice for animations that feel natural and pleasing to the eye.

The animation-timing-function property is used to control the speed curve of an animation. It allows you to specify how the animation progresses through time, giving you control over the easing and acceleration of the animation.

The CSS unit 'vh' represents a percentage of the viewport's height. This means that 1vh is equal to 1% of the height of the viewport in which the web page is displayed. It's a relative unit often used for responsive design.

The @font-face rule in CSS allows web designers to use fonts that are not installed on the user's machine. This is useful for ensuring consistent typography across different devices.

PostCSS is a versatile tool that allows developers to create custom transformations or plugins for their projects. These transformations can be used to modify or extend the functionality of CSS, making it a powerful and flexible tool for developers.

The CSS property that allows you to set a graphical element to be used as a mask against another element is mask-image. This property lets you specify an image or SVG as a mask, which defines the transparency of an element based on the mask's alpha channel. It's often used for creating complex visual effects and overlays.