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Regenerated monthly from web-features dataLast run · July 29, 2026

What clears next

A feature becomes widely available exactly 30 months after the last browser ships it. No committee, no vote, just a date, which means the next year of them is already on the books. Here is every HTML and CSS feature that crosses the line between now and July 2027, month by month, with nothing left out.

A date is not a verdict, though. Thirty months means every core browser has had the feature that long and the versions without it have aged out. It says nothing about whether the implementations agree, or whether the fallback in your codebase is safe to pull.

Two caveats, stated up front

The date a feature became newly available is sometimes revised when the underlying data is corrected, which moves it to a different month here. A feature can also lose its Baseline status if a browser drops support, which takes it off the list. Both are rare. The table regenerates from the dataset every month, so it is never more than a month behind a correction.

Through Jul 2027
  • Aug 2026from Feb 2024

    Declarative shadow DOM

    Server-rendered shadow roots with no script to attach them.

  • Sep 2026from Mar 2024

    white-space-collapse · paint-order

    white-space-collapse scores 0.70 or below on every desktop browser, so the date is running well ahead of the implementations.

  • Oct 2026from Apr 2024

    align-content in block layouts · transform-box · Vertical form controls

    Block-layout align-content removes a flexbox wrapper used purely for centering, but test scores split 0.45 to 0.95 across browsers. transform-box is the quiet one: it picks the box a transform measures against, which is mostly an SVG concern.

  • Nov 2026from May 2024

    light-dark() · text-wrap: balance · zoom · :state() · round(), mod(), rem()

    The strongest month in the window: four real deletions. zoom crosses the line too, but nobody has been waiting for it.

  • Dec 2026from Jun 2024

    Gradient interpolation

    Clean test scores everywhere. Nothing to watch out for.

  • Jan 2027from Jul 2024

    Alt text for generated content · Registered custom properties · font-size-adjust

    Alt text for generated content is Hold-shaped: three browsers score 0 despite the date. Registered custom properties is the sleeper: @property in the stylesheet replaces a CSS.registerProperty() call in script.

  • Feb 2027from Aug 2024

    @starting-style · transition-behavior

    Together, these are what let you animate display without a JavaScript timer.

  • Mar 2027from Sep 2024

    Mutually exclusive <details> · backdrop-filter · Relative colors

    details-name deletes an accordion script outright.

  • Apr 2027from Oct 2024

    Scroll to text fragment · text-wrap · Fetch priority

    text-wrap scores a perfect 1 on every browser. fetchpriority is an attribute where a preload hint used to be.

  • May 2027from Nov 2024

    Nothing

    Nothing became newly available in November 2024, so nothing clears.

  • Jun 2027from Dec 2024

    ::target-text · ruby-align · ruby-position · scrollbar-gutter · scrollbar-width · Page setup

    The scrollbar pair is the real deletion: styled scrollbars without the ::-webkit- prefixes. Page setup stays weakly implemented, probably a Hold whatever the date says.

  • Jul 2027from Jan 2025

    Popover

    The biggest deletion in the whole window: a popover library, gone.

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