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document.caretPositionFromPoint(): The document.caretPositionFromPoint() method finds an insertion point, represented by a DOM node and an offset within that node, for given coordinates in the viewport.
Event timing: The event and first-input performance entries and the PerformanceEventTiming API measures the latency of user input events, such as mouse clicks or keypresses. They're used to calculate Interaction to Next Paint (INP), a common metric for perceived responsiveness.
Largest contentful paint (LCP): The largest-contentful-paint performance entry and the LargestContentfulPaint API measures the time it takes for the largest image or text to appear. Largest contentful paint (LCP) is a common metric for perceived loading times.
scrollbar-color: The scrollbar-color CSS property sets the color of the scrollbar track and thumb.
scrollend: The scrollend event fires when an element or document has finished scrolling.

calc() keywords: The e, pi, infinity, and NaN keywords represent well-defined constants accepted in CSS math functions such as calc().
color(): The color() function picks a color from a given color space. Wide gamut color spaces like display-p3 allow showing more vibrant and saturated colors than the standard srgb color space.
color-mix(): The color-mix() function mixes two colors in a given color space and by a given amount. Commonly, lighter or darker variations of a color are created by mixing with white or black.
Compression streams: The CompressionStream and DecompressionStream APIs compress and decompress data using the gzip or deflate formats.
Canvas createConicGradient(): The createConicGradient() methods draw a conic gradient to a 2D canvas.