The CSS pseudo-class :not() is used to select elements that do not match a specific criteria. It is used to exclude elements that would typically be selected by a CSS selector. For example, :not(.classname) selects all elements that do not have the specified class.

The CSS rule "ul > li" specifically targets only the direct child li elements of a ul element. It will not target li elements that are nested further within the hierarchy of the HTML structure.

The CSS rule "ul + ul" is a sibling combinator that targets an unordered list that immediately follows another unordered list in the HTML structure. This is used to style a specific occurrence of an unordered list in relation to another.

To ensure that an element remains in the normal document flow and doesn't overlap floated siblings, you should use the clear property with a value other than none. This property specifies which side of an element other floating elements are not allowed.

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.

To ensure that text remains visible during web font loading, you can set the "font-display" property in your CSS to "swap." This tells the browser to use a fallback font until the web font is fully loaded and ready to display, preventing a "FOUT" (Flash of Unstyled Text) for web fonts.

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 */ }.