The :not() functional pseudo-class matches elements that do not match the selectors in its argument.

The clip-path CSS property and SVG attribute set the visible area of an element. Everything outside the area will be hidden.

The :where() CSS functional pseudo-class takes a selector list as its argument, and matches any element that can be selected by one of the selectors in that list. It is functionally equivalent to the selectors in the list, but doesn't affect the CSS rule specificity.

The :is() CSS functional pseudo-class takes a selector list as its argument, and matches any element that can be selected by one of the selectors in that list.

The text-underline-offset CSS property shifts underlines on text from the initial position by a given distance. The initial position is affected by the text-underline-position property.

The conic-gradient() and repeating-conic-gradient() CSS functions create backgrounds that progress between two or more colors around a center point.

Instructions and blocks can produce multiple result values.

The WebP image format is a raster graphics file format that supports animation, alpha transparency, and lossy as well as lossless compression.

The web animation API programmatically creates, inspects, and controls element animations, to change and synchronize appearance over time.

The scroll() and scrollBy() methods change the scroll position of overflow content within an element. Similar to setting scrollTop and scrollLeft properties, but with options setting whether the scroll should animate smoothly or jump. Note that scrollTo() is an alias for scroll().

The logical AND assignment (&&=) and the logical OR assignment (||=) operators short-circuit the respective binary logical operators.

The nullish coalescing (??) and nullish coalescing assignment (??=) operators return (or assign) its right-hand side operand when its left-hand side operand is null or undefined, and otherwise returns its left-hand side operand.

The text-orientation CSS property sets the how text is typeset within a line when the writing mode is vertical.

The WEBGL_debug_shaders extension for WebGL 1.0 and 2.0 contexts adds the getTranslatedShaderSource() method to debug shaders from privileged contexts.

The steps() CSS easing function divides an animation or transition into equidistant intervals, jumping from value to value. The step-start and step-end keyword values are presets with a single interval.

The Intl.Locale API parses Unicode locale identifiers, with language, region, and script codes, such as zh-Hans-CN or en-GB.

The Intl.RelativeTimeFormat API creates a locale-aware formatter that turns an object representing a relative time (such as '1 day ago') into a localized string.

The Promise.any() static method returns a promise that fulfills as soon as the first of an iterable of promises fulfills, with that promise's value. Otherwise, it rejects with an AggregateError when all of the promises have rejected.

The EXT_color_buffer_half_float extension for WebGL 1.0 and 2.0 contexts renders 16-bit floating-point color buffers.

The BigInt JavaScript type represents integers of any size, including integers too large for the primitive Number type.

The replaceAll() method of strings returns a new string where all matches of a pattern (a string or regular expression) have been substituted with a replacement string.

The queueMicrotask() method schedules a function to run after the currently running synchronous JavaScript finishes but before returning to the event loop.

To improve readability for numeric literals, underscores (_) can be used as separators. For example, 1_050.95 is equivalent to 1050.95.

The text-underline-position CSS property sets the position of underlines on text. For example, text-underline-position: under places the underline below the text, avoiding crossing descenders. The underline may be further adjusted by the text-underline-offset property.

The ResizeObserver API observes and reacts to changes in the size of DOM elements.

Pointer events, such as pointerdown, and the PointerEvent API, represent general pointing inputs, from a wide range of devices, such as a mouse, pen or stylus, or touch with one or more fingers. Not to be confused with the pointer-events CSS property.

The line-break CSS property sets how strictly to apply rules for wrapping text to new lines, especially for symbols and punctuation.

The part and exportparts HTML attributes expose elements of a shadow DOM as named parts, which can be selected by the ::part() CSS pseudo-element for styling.

The column-span CSS property controls whether a child element extends across all columns of a multi-column parent.

The :read-only and :read-write CSS pseudo-classes match elements that are read-only or read-write, respectively. For example, :read-only matches <input> and <textarea> elements with the readonly attribute.