The random() CSS function chooses a random numeric value within a specified range. This allows for dynamic, randomized styling using CSS.

The at-rule() function, when used with @supports, checks if a CSS at-rule is supported. For example @supports at-rule(@starting-style) checks if the @starting-style at-rule is supported.

The attr() CSS function, in the context of any property, returns the value of an attribute of an HTML element, with the option to return it as a specific type or unit. You can set a default value for missing or invalid attributes.

The window-drag: move CSS declaration sets an element as a window drag handle, like a device's app title bar. You can use this to add click-and-drag areas to an installed progressive web app, often alongside window controls overlay.

The named-feature() function, when used with @supports, checks if a named CSS behavior is supported. The CSS behavior names are defined by specification. For example, @supports named-feature(anchor-position-follows-transforms) checks whether anchor-positioning applies after transforms."

The overflow-clip-margin CSS property sets how far overflow content may appear outside the bounds of an element before it's clipped by effects such as overflow: clip.

The accent-color CSS property sets a color for checkboxes, radio buttons, and other form controls.

The @function CSS at-rule defines a custom function that takes CSS values or custom properties as arguments, and returns a CSS value. It can be based on conditional logic such as by using the @media at-rule.

The if() CSS function is an inline conditional value that returns a value based on a set of conditions.

The reading-flow CSS property sets the order in which flex or grid elements are rendered to speech or reached via focus navigation. The reading-order property overrides this order.

The dynamic-range-limit CSS property controls the peak luminance of high dynamic range content. You can use this to coordinate the apparent brightness of HDR and SDR content.

The calc-size() CSS function computes mathematical expressions that include height and width keyword values, for example calc-size(fit-content, size / 2). Not to be confused with the calc() CSS function, which cannot use keyword values.

You can animate elements between display: none and any other display value or animate between content-visibility: hidden and any other content-visibility value. This also applies to transitions.

The text-spacing-trim CSS property controls spacing around CJK characters, avoiding excessive whitespace when using full-width punctuation characters.

The overlay CSS property, used as an allow-discrete CSS transition, prevents a top layer element, such as a popover or a <dialog>, from being removed from the top layer before it has finished animating. You can't set the value of the overlay property; only use it as transition property.

The overflow: overlay CSS declaration is an alias to overflow: auto. Historically, it caused non-standard behavior, allowing scrollbars to overlay content without taking up layout space.

The margin-trim CSS property removes the margins of child elements when they meet the edges of the container.

The initial-letter CSS property sets the number of lines the first letter of an element occupies. You can use the property to make a raised capital or drop cap.

The object-view-box CSS property crops and zooms to an inset area of an image.

The cursor CSS property styles the pointer, allowing you to provide hints to the user on how to interact with the hovered element.

The display: ruby CSS declaration renders an element with the box layout of a <ruby> HTML element. Child elements may use equivalents to <ruby> internal elements such as display: ruby-base for <rb>.

The user-select CSS property controls which elements can be selected by the user.

The resize CSS property sets whether an element can be resized by the user, and on which axes.