When 'box-sizing' is set to 'content-box,' the total width of an element includes padding and border. The content width does not include these, but the total width does.

The technique where a low-quality or system font is displayed initially and then replaced with a higher-quality custom font when it's loaded is known as "Font FOUT" or "Flash of Unstyled Text." This approach improves perceived performance and ensures a smoother transition between fonts.

Autoprefixing is the process of adding vendor-specific prefixes to CSS properties to ensure cross-browser compatibility. It automatically generates CSS rules with the necessary prefixes, like -webkit-, -moz-, or -ms-, making sure that your styles are correctly interpreted by different browsers. This helps avoid the need for writing separate CSS rules for each browser.

When an element does not have a specific style defined but its parent does, it will inherit the styles from its parent. This inheritance is a fundamental concept in CSS and helps maintain consistency in the appearance of web pages.

To target all paragraphs immediately after an h2 element within the same container, you would use the selector h2 + p. This selector selects any

element that is immediately preceded by an

element.

The value of the display property that makes an element behave like a block-level element but allows it to sit inline with other content is inline-block. This is particularly useful when you want an element to have block-level properties (like the ability to set width and height) while still flowing inline with adjacent content.

To create a media query for screens wider than 768px, you should use the @media rule, followed by the screen keyword (optional) and and (min-width: 768px). The correct option is @media screen and (min-width: 768px) { /* Styles go here */ }.

PostCSS is a popular tool used in web development to automatically add vendor prefixes to CSS properties. It is highly configurable and can be integrated into your build process. PostCSS, along with plugins like Autoprefixer, streamlines the process of making your CSS code cross-browser compatible by adding the necessary prefixes.

To vertically center an inline or inline-block element relative to its parent, you'd set the "vertical-align" property to middle. This property allows you to control the vertical alignment of inline-level elements within their line boxes.

SASS (Syntactically Awesome Style Sheets) is primarily used in web development for simplifying and organizing CSS. It introduces features like variables, nesting, and mixins, making your CSS more maintainable and efficient.