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alpha(): The alpha() CSS function computes a relative color value by adjusting the opacity of an origin color.
Animation accessors: The animation property of an AnimationEvent or TransitionEvent object is the Animation object that represents the animation (and thus the element) that fired an animation event.
ariaNotify(): The ariaNotify() method of Element and Document requests assistive technology software, if activated, to announce a message to the user. This can help make dynamic content changes more accessible to users.
Asynchronously iterable streams: Asynchronous iteration of a stream allows you to use for await … of loops to iterate through a stream's incoming data.
light-dark() image values: The light-dark() CSS function accepts, in addition to colors, two <image> values, such as a gradient or URL, and uses one depending on the current color scheme.

AbortSignal.any(): The AbortSignal.any() static method combines an iterable of abort signals into a single signal, with the abort reason taken from the first signal to abort.
white-space-collapse: The white-space-collapse CSS property sets whether new line characters are shown as line breaks, and whether multiple consecutive spaces are all displayed or combined.
Lazy-loading images and iframes: The loading="lazy" attribute for <img> and <iframe> elements blocks loading the external resource until the user scrolls to that element's part of the page.
Nesting: CSS nesting allows for shorter selectors, easier reading, and more modularity by nesting rules inside others.
Masks: The mask CSS property (and several longhand properties) partially or completely hides an element according to the shape and depth of an image.