The border-spacing property in CSS is used to set the distance between the borders of adjacent cells in a table. Example: table { border-spacing: 5px; }.

The border-radius property is used to round the corners of an element. You can specify the radius for each corner or apply a single value for all corners. Example: element { border-radius: 10px; }.

The border-collapse property in CSS is used with tables to define whether the table's borders should collapse into a single border (collapse) or be separated (separate). Example: table { border-collapse: collapse; }.

The font-variant property controls the use of alternate glyphs in fonts, such as small-caps or normal. Valid values are normal, small-caps, etc. "Large-caps" is not a valid value for font-variant.

The text-shadow property is used in CSS to add a shadow effect to text. It allows you to specify the horizontal and vertical offsets, blur radius, and color of the shadow. Example: element { text-shadow: 2px 2px 4px #000000; }.

The outline property in CSS is used to draw a line outside the border of an element. It is similar to border but doesn't affect the layout or position of elements. Example: element { outline: 2px solid red; }.

The ~ (tilde) selector in CSS is used to select all sibling elements that come after a specified element. The syntax div ~ p selects all <p> elements that are siblings of a <div> element, meaning they are on the same level in the document tree.

To select all <p> elements within a <div> element, the correct syntax is div p. This is a descendant selector, which means it selects all <p> elements that are inside a <div>, regardless of how deeply nested they are.

In CSS, to select elements with a specific class, you use a period (.) followed by the class name. Example: .example { color: red; } will apply the style to all elements with the class example.

The text-transform: capitalize; property in CSS capitalizes the first letter of each word in a text element. Example: element { text-transform: capitalize; }.