Features missing only in Chromium

The following features are implemented in all other browser engines, but not in Chromium.

• accent-color

  Limited availability

  The accent-color CSS property sets a color for checkboxes, radio buttons, and other form controls.

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  • Chrome 93 Released on 2021-08-31
  • Chrome Android Not supported
  • Edge 93 Released on 2021-09-02
  • Firefox 92 Released on 2021-09-07
  • Firefox for Android 92 Released on 2021-09-07
  • Safari 26.2 Released on 2025-12-12
  • Safari on iOS 26.2 Released on 2025-12-12

  Baseline availability blocked since December 2025 by Chromium (11 months)

• anchors-valid and anchors-visible

  The position-visibility: anchors-valid and position-visibility: anchors-visible CSS declarations are aliases for anchor-valid and anchor-visible.

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  • Chrome Not supported
  • Chrome Android Not supported
  • Edge Not supported
  • Firefox 147 Released on 2026-01-13
  • Firefox for Android 147 Released on 2026-01-13
  • Safari 26.2 Released on 2025-12-12
  • Safari on iOS 26.2 Released on 2025-12-12

  Baseline availability blocked since January 2026 by Chromium (10 months)

• Case-sensitive attribute selector

  Limited availability

  The s identifier in a CSS attribute selector matches attribute values case-sensitively in document languages like HTML where attribute values are case-insensitive.

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  • Chrome Not supported
  • Chrome Android Not supported
  • Edge Not supported
  • Firefox 66 Released on 2019-03-19
  • Firefox for Android 66 Released on 2019-03-19
  • Safari 27 Released on 2026-09-14
  • Safari on iOS 27 Released on 2026-09-14

  Baseline availability blocked since September 2026 by Chromium (2 months)

• Clearing site data

  Limited availability

  The Clear-Site-Data header deletes browsing data (such as cookies, storage, or cache) associated with the requesting website.

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  • Chrome Not supported
  • Chrome Android Not supported
  • Edge Not supported
  • Firefox 138 Released on 2025-04-29
  • Firefox for Android 138 Released on 2025-04-29
  • Safari 17 Released on 2023-09-18
  • Safari on iOS 17 Released on 2023-09-18

  Baseline availability blocked since April 2025 by Chromium (19 months)

• color-adjust

  The color-adjust shorthand CSS property allows multiple performance related color adjustments to be set at once. Setting the print-color-adjust CSS property directly is preferred, as it is the only such adjustment so far defined.

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  • Chrome Not supported
  • Chrome Android Not supported
  • Edge Not supported
  • Firefox 48 Released on 2016-08-02
  • Firefox for Android 48 Released on 2016-08-02
  • Safari 15.4 Released on 2022-03-14
  • Safari on iOS 15.4 Released on 2022-03-14

  Baseline availability blocked since March 2022 by Chromium (56 months)

• color-mix() with three or more colors

  Limited availability

  The color-mix() CSS function accepts three or more colors.

  Learn more

  • Chrome Not supported
  • Chrome Android Not supported
  • Edge Not supported
  • Firefox 150 Released on 2026-04-21
  • Firefox for Android 150 Released on 2026-04-21
  • Safari 27 Released on 2026-09-14
  • Safari on iOS 27 Released on 2026-09-14

  Baseline availability blocked since September 2026 by Chromium (2 months)

• fastSeek()

  Limited availability

  The fastSeek() method seeks an <audio> or <video> element as fast as possible, by seeking to a keyframe instead of exactly the requested time.

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  • Chrome Not supported
  • Chrome Android Not supported
  • Edge Not supported
  • Firefox 31 Released on 2014-07-22
  • Firefox for Android 31 Released on 2014-07-22
  • Safari 8 Released on 2014-10-16
  • Safari on iOS 8 Released on 2014-09-17

  Baseline availability blocked since October 2014 by Chromium (145 months)

• Fetch form data

  Limited availability

  The Request.formData() and Response.formData() methods read a request or response body and return a FormData promise. You can use it to access the fields of a form submission.

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  • Chrome Not supported
  • Chrome Android Not supported
  • Edge Not supported
  • Firefox 39 Released on 2015-07-02
  • Firefox for Android 39 Released on 2015-07-02
  • Safari 14.1 Released on 2021-04-26
  • Safari on iOS 14.5 Released on 2021-04-26

  Baseline availability blocked since April 2021 by Chromium (67 months)

• JPEG XL

  Limited availability

  The JPEG XL image format is a raster graphics file format that supports animation, alpha transparency, and lossy as well as lossless compression.

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  • Chrome 155 Released on 2026-10-06
  • Chrome Android 155 Released on 2026-10-06
  • Edge Not supported
  • Firefox 158 Released on 2026-10-13
  • Firefox for Android 158 Released on 2026-10-13
  • Safari 17 Released on 2023-09-18
  • Safari on iOS 17 Released on 2023-09-18

  Baseline availability blocked since October 2026 by Chromium (1 months)

• Media element pseudo-classes

  Limited availability

  The :playing, :paused, :seeking, :buffering, :stalled, :muted, and :volume-locked CSS pseudo-classes match <audio> and <video> elements based on their state.

  Learn more

  • Chrome Not supported
  • Chrome Android Not supported
  • Edge Not supported
  • Firefox 150 Released on 2026-04-21
  • Firefox for Android 150 Released on 2026-04-21
  • Safari 15.4 Released on 2022-03-14
  • Safari on iOS 15.4 Released on 2022-03-14

  Baseline availability blocked since April 2026 by Chromium (7 months)

• ReadableStream.from()

  Limited availability

  The ReadableStream.from() static method converts an iterable or async iterable object, such as an array or async generator function, into a readable stream.

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  • Chrome Not supported
  • Chrome Android Not supported
  • Edge Not supported
  • Firefox 117 Released on 2023-08-29
  • Firefox for Android 117 Released on 2023-08-29
  • Safari 27 Released on 2026-09-14
  • Safari on iOS 27 Released on 2026-09-14

  Baseline availability blocked since September 2026 by Chromium (2 months)

• AccentColor and AccentColorText

  Limited availability

  The AccentColor and AccentColorText CSS system color values are the background color and text color of accented user interface controls. To prevent browser fingerprinting, browsers may (and often do) use fixed color values that do not reflect user customization or theming choices.

  Learn more

  • Chrome 149 Released on 2026-06-02
  • Chrome Android Not supported
  • Edge 149 Released on 2026-06-04
  • Firefox 103 Released on 2022-07-26
  • Firefox for Android 103 Released on 2022-07-26
  • Safari 16.5 Released on 2023-05-18
  • Safari on iOS 16.5 Released on 2023-05-18

  Baseline availability blocked since June 2026 by Chromium (5 months)

• text-autospace

  Limited availability

  The text-autospace CSS property sets whether and how to insert spaces in inter-script text (such as when mixing Latin and Chinese characters) and around punctuation.

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  • Chrome Not supported
  • Chrome Android Not supported
  • Edge Not supported
  • Firefox 145 Released on 2025-11-11
  • Firefox for Android 145 Released on 2025-11-11
  • Safari 27 Released on 2026-09-14
  • Safari on iOS 27 Released on 2026-09-14

  Baseline availability blocked since September 2026 by Chromium (2 months)

• iterationComposite

  Limited availability

  The iterationComposite property of a KeyframeEffect object sets whether an animation's iterations are calculated independently ("replace") or are accumulated with the value of the previous iteration ("accumulate").

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  • Chrome Not supported
  • Chrome Android Not supported
  • Edge Not supported
  • Firefox 80 Released on 2020-08-25
  • Firefox for Android 80 Released on 2020-08-31
  • Safari 16.4 Released on 2023-03-27
  • Safari on iOS 16.4 Released on 2023-03-27

  Baseline availability blocked since March 2023 by Chromium (44 months)

• WebVTT cue alignment

  Limited availability

  The WebVTT cue alignment settings control which part of the cue is aligned with the given line and position. Cue alignment is set using line and position settings in WebVTT files or the lineAlign and positionAlign properties of VTTCue using JavaScript.

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  • Chrome Not supported
  • Chrome Android Not supported
  • Edge Not supported
  • Firefox 31 Released on 2014-07-22
  • Firefox for Android 31 Released on 2014-07-22
  • Safari 14.1 Released on 2021-04-26
  • Safari on iOS 14.5 Released on 2021-04-26

  Baseline availability blocked since April 2021 by Chromium (67 months)

• WebVTT regions

  Limited availability

  WebVTT regions set the areas of the video where captions or subtitles should be rendered, such as placing roll-up captions used for live captions.

  Learn more

  • Chrome Not supported
  • Chrome Android Not supported
  • Edge Not supported
  • Firefox 59 Released on 2018-03-13
  • Firefox for Android 59 Released on 2018-03-13
  • Safari 14.1 Released on 2021-04-26
  • Safari on iOS 14.5 Released on 2021-04-26

  Baseline availability blocked since April 2021 by Chromium (67 months)