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• Safari on iOS 18.4

New features in Safari on iOS 18.4 (released on 2025-03-31)

• Atomics.pause()

  Newly available since 2025-04-01

  Tags: javascript

  The Atomics.pause() static method gives a hint to the CPU that the code calling the method is in a short-duration wait for shared memory, known as spinning or a spinlock.

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  • Chrome 133 Released on 2025-02-04
  • Chrome Android 133 Released on 2025-02-04
  • Edge 133 Released on 2025-02-06
  • Firefox 137 Released on 2025-04-01
  • Firefox for Android 137 Released on 2025-04-01
  • Safari 18.4 Released on 2025-03-31
  • Safari on iOS 18.4 Released on 2025-03-31

• ClipboardItem.supports()

  Newly available since 2025-03-31

  Tags: api Groups: Clipboard

  The ClipboardItem.supports() static method checks if the browser supports writing data types such as "image/svg+xml" or other custom formats to the system clipboard.

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  • Chrome 121 Released on 2024-01-23
  • Chrome Android 121 Released on 2024-01-23
  • Edge 121 Released on 2024-01-25
  • Firefox 127 Released on 2024-06-11
  • Firefox for Android 127 Released on 2024-06-11
  • Safari 18.4 Released on 2025-03-31
  • Safari on iOS 18.4 Released on 2025-03-31

• ::details-content

  Limited availability

  Tags: css Groups: CSS > Selectors

  The ::details-content pseudo-element selects the expandable content of a <details> element, excluding the <summary>.

  Baseline availability blocked since March 2025 by Firefox (1 months)

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  • Chrome 131 Released on 2024-11-12
  • Chrome Android 131 Released on 2024-11-12
  • Edge 131 Released on 2024-11-14
  • Firefox ❌
  • Firefox for Android ❌
  • Safari 18.4 Released on 2025-03-31
  • Safari on iOS 18.4 Released on 2025-03-31

• Iterator methods

  Newly available since 2025-03-31

  Tags: javascript Groups: JavaScript > Iterators

  The Iterator object is an abstract base for objects that implement the iterator protocol. It provides methods common to built-in iterators, such as filter(), find(), map(), and reduce(). You can also use the static method Iterator.from() to convert an existing iterable into an Iterator.

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  • Chrome 122 Released on 2024-02-20
  • Chrome Android 122 Released on 2024-02-20
  • Edge 122 Released on 2024-02-23
  • Firefox 131 Released on 2024-10-01
  • Firefox for Android 131 Released on 2024-10-01
  • Safari 18.4 Released on 2025-03-31
  • Safari on iOS 18.4 Released on 2025-03-31

• Partitioned cookies

  Limited availability

  Tags: api http

  Partitioned cookies allow you to opt a cookie into partitioned storage, with a separate cookie jar per top-level site. Also known as Cookies Having Independent Partitioned State or CHIPS.

  Baseline availability blocked since March 2025 by Firefox (1 months)

  Learn more

  • Chrome 114 Released on 2023-05-30
  • Chrome Android 114 Released on 2023-05-30
  • Edge 114 Released on 2023-06-02
  • Firefox ❌ Vendor position : positive
  • Firefox for Android ❌ Vendor position : positive
  • Safari 18.4 Released on 2025-03-31
  • Safari on iOS 18.4 Released on 2025-03-31

• dialog.requestClose()

  Limited availability

  Tags: api Groups: HTML > HTML elements

  The requestClose() method of a <dialog> HTML element closes the dialog, firing a cancel event first, which listeners can use to prevent the dialog from closing. This differs from the close() method, which only fires the non-cancelable close event.

  Baseline availability blocked since March 2025 by Firefox (1 months)

  Learn more

  • Chrome 134 Released on 2025-03-04
  • Chrome Android 134 Released on 2025-03-04
  • Edge 134 Released on 2025-03-06
  • Firefox ❌
  • Firefox for Android ❌
  • Safari 18.4 Released on 2025-03-31
  • Safari on iOS 18.4 Released on 2025-03-31

• Screen wake lock

  Newly available since 2025-03-31

  Tags: api html http

  The navigator.wakeLock.request("screen") API prevents the device's screen from dimming or being turned off.

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  • Chrome 84 Released on 2020-07-27
  • Chrome Android 84 Released on 2020-07-27
  • Edge 84 Released on 2020-07-16
  • Firefox 126 Released on 2024-05-14
  • Firefox for Android 126 Released on 2024-05-14
  • Safari 16.4 Released on 2023-03-27
  • Safari on iOS 18.4 Released on 2025-03-31

• Single color stop gradients

  Newly available since 2025-04-04

  Tags: css Groups: CSS > Gradients

  A single color stop can be provided to the linear-gradient(), radial-gradient(), and conic-gradient() CSS functions, and their repeating counterparts, to create a solid color background.

  Learn more

  • Chrome 135 Released on 2025-04-01
  • Chrome Android 135 Released on 2025-04-01
  • Edge 135 Released on 2025-04-04
  • Firefox 136 Released on 2025-03-04
  • Firefox for Android 136 Released on 2025-03-04
  • Safari 18.4 Released on 2025-03-31
  • Safari on iOS 18.4 Released on 2025-03-31

• Exception references with exnref (WebAssembly)

  Limited availability

  Tags: webassembly Groups: WebAssembly

  When caught, an exception is reified into an exception reference, a value of the new type exnref.

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  • Chrome ❌
  • Chrome Android ❌
  • Edge ❌
  • Firefox 131 Released on 2024-10-01
  • Firefox for Android 131 Released on 2024-10-01
  • Safari 18.4 Released on 2025-03-31
  • Safari on iOS 18.4 Released on 2025-03-31