Now You Can Use — Web Platform Baseline Reference

The ariaNotify() method of Element and Document requests assistive technology software, if activated, to announce a message to the user. This can help make dynamic content changes more accessible to users.

The alpha() CSS function computes a relative color value by adjusting the opacity of an origin color.

The light-dark() CSS function accepts, in addition to colors, two <image> values, such as a gradient or URL, and uses one depending on the current color scheme.

The JavaScript promise integration (JSPI) suspends a WebAssembly module when it calls a JavaScript method that returns a promise. The module resumes when the promise is resolved. You can use this to call asynchronous Web APIs from synchronous WebAssembly.

The await keyword, when used at the top level of a module (outside of an async function), delays parent module execution until after a promise fulfills.

The overflow-anchor CSS property sets an element as a possible scroll anchor, reducing unintended scrolling when document changes occur above the current scrollport. This is enabled by default where supported.

Asynchronous iteration of a stream allows you to use for await … of loops to iterate through a stream's incoming data.

The autocorrect global HTML attribute controls whether to automatically correct spelling or punctuation errors for user input.

The progress() CSS function returns a ratio for the relative position of one value between two other values, clamped between 0 and 1. You can use it to interpolate a value for other calculations.

Chrome 138

Firefox 154

Safari 26.2

Edge 138

Baseline Date: Aug 18, 2026

Chrome 130

Firefox 153

Safari 17

Edge 130

Baseline Date: Jul 21, 2026

Chrome 123

Firefox 152

Safari 26.2

Edge 123

Baseline Date: Jun 16, 2026

Container style queries with the @container at-rule apply styles to an element based on the values of custom properties of its container.

The source property of a ToggleEvent object is the element which triggered the toggle event to fire for a popover, <dialog>, or <details> element, if applicable.

The :open CSS pseudo-class matches elements that have open states, like <details>, <dialog>, or <select>, based on their state.

Name-only container queries with the @container … at-rule apply styles to an element based on the name of the element's container alone.

The text-decoration-skip-ink: all CSS declaration forces interruptions in underlines and overlines where the line would cross a glyph. This contrasts with auto, which does not skip for CJK glyphs.

The image-rendering: crisp-edges CSS declaration scales images to preserve lines without blurring.

The contrast-color() CSS function picks a color that has guaranteed contrast against a specified foreground or background color.

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.

The @scope CSS at-rule sets the scope for a group of rules.

CSP violation reporting sends a report to a URL nominated by the Reporting-Endpoints header or the ReportingObserver API when a page violates its content security policy.

The Reporting-Endpoints HTTP header and ReportingObserver() API send selected reports, such as Content Security Policy (CSP) violation reports or crash reports, to a nominated URL or callback function.

Custom highlights style arbitrary text ranges, without adding extra elements to the DOM.

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.

A ReadableStream constructed with { type: "bytes" } reads bytes from a stream without making extra copies, improving efficiency for streams of large chunks. Also known as BYOB or bring your own buffer.

The baseline-shift CSS property sets the position of an element relative to its dominant baseline.

The font-family: math CSS declaration uses the browser default font face for displaying mathematical expressions.