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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.timeout(): The AbortSignal.timeout() static method returns an abort signal that automatically aborts after a specified duration.
align-content in block layouts: The align-content property vertically aligns content in block layouts, like it does in flex or grid layouts.
Intl.Segmenter: The Intl.Segmenter API creates a locale-aware text splitter that can separate a string into meaningful graphemes, words, or sentences.
transform-box: The transform-box CSS property sets the position and dimensions of the reference box relative to which an element's transformations are calculated.
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.