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Use the Web platform features explorer to discover new features and APIs and stay up-to-date with changes.

Newly available across browsers (RSS feed)

contrast-color(): The contrast-color() CSS function picks a color that has guaranteed contrast against a specified foreground or background color.
Math.sumPrecise(): The Math.sumPrecise() static method returns the sum of an iterable of numbers. It avoids the precision loss of intermediate partial sums, as found using reduce() or a loop to add together an array of values.
Math font family: The font-family: math CSS declaration uses the browser default font face for displaying mathematical expressions.
Custom highlights: Custom highlights style arbitrary text ranges, without adding extra elements to the DOM.
Iterator.concat(): The Iterator.concat() JavaScript method returns an iterator that yields values from a sequence of iterators, exhausting each iterator before moving on to the next.

ARIA attribute reflection: WAI-ARIA attributes have corresponding properties on Element and ElementInternals objects.
contain-intrinsic-size: The contain-intrinsic-size CSS property sets the intrinsic size of an element. When using size containment, the browser will lay out the element as if it had a single child of this size.
@counter-style: The @counter-style CSS at-rule sets custom counter styles for list items. For example, you can use a sequence of specific symbols instead of numbers for an ordered list.
Device orientation events: The DeviceMotion and DeviceOrientation events report the movement and orientation of the browser's device in physical space. Note that coordinates can differ noticeably between platforms and devices.
dirname: The dirname attribute of <textarea> and <input> HTML elements includes the field's writing direction as form data on submission.