Platform status

Provides a way to blend an HTML or SVG element with its backdrop

Roadmap Priority: Low — We are still evaluating this technology. There may be significant spec stabilization, foundational work, or additional community input required before we can begin development.

Allows hiding of portions of a visible elements.

Roadmap Priority: Medium — Development is likely for a future release.

Support the attr() function as a component value in properties applied to an element. Currently, attr() is only supported in the content property applied to pseudo-elements.

Roadmap Priority: Low — We are still evaluating this technology. There may be significant spec stabilization, foundational work, or additional community input required before we can begin development.

CSS properties for aligning boxes within their container. Allows for true vertical centering among other features.

Roadmap Priority: Low — We are still evaluating this technology. There may be significant spec stabilization, foundational work, or additional community input required before we can begin development.

The relational pseudo-class, :has(), is a functional pseudo-class taking a relative selector list as an argument. Similar to jQuery’s :has() selector.

Roadmap Priority: Low — We are still evaluating this technology. There may be significant spec stabilization, foundational work, or additional community input required before we can begin development.

Define arbitrary shapes inside and around which inline content can flow.

Roadmap Priority: Medium — Development is likely for a future release.

Applies a CSS filter effect to the content behind an element. This is not the element's background but the content that would be drawn behind it.

Roadmap Priority: Low — We are still evaluating this technology. There may be significant spec stabilization, foundational work, or additional community input required before we can begin development.

Specifies the blending mode used for each background layer

Roadmap Priority: Low — We are still evaluating this technology. There may be significant spec stabilization, foundational work, or additional community input required before we can begin development.

Adds a will-change CSS property, that can be used to signal that a particular property is likely to be changed in the future, or that an element's content is likely to change.

Roadmap Priority: Low — We are still evaluating this technology. There may be significant spec stabilization, foundational work, or additional community input required before we can begin development.

Motion paths allow authors to animate any graphical object along an author specified path.

Roadmap Priority: Medium — Development is likely for a future release.

Specifies a gradient where the color stops are placed around the circumference of a circle.

Roadmap Priority: Low — We are still evaluating this technology. There may be significant spec stabilization, foundational work, or additional community input required before we can begin development.

Extends the CSS sizing properties with keywords that represent content-based "intrinsic" sizes and context-based "extrinsic" sizes, allowing CSS to more easily describe boxes that fit their content or fit into a particular layout context.

Roadmap Priority: Low — We are still evaluating this technology. There may be significant spec stabilization, foundational work, or additional community input required before we can begin development.

Provides a hint to the browser on which scaling algorithm should be used.

Roadmap Priority: Low — We are still evaluating this technology. There may be significant spec stabilization, foundational work, or additional community input required before we can begin development.

Enables responsive images in CSS by specifiying multiple resolutions of an image that the browser can select from for the given situation.

Roadmap Priority: Medium — Development is likely for a future release.

The all property is a shorthand that resets all CSS properties except direction and unicode-bidi

Roadmap Priority: Medium — Development is likely for a future release.

Boolean attribute for the <style> element (<style scoped>). When present, its styles only apply to the parent element.

A viewport relative length unit equal to the larger of vw (viewport width) or vh (viewport height).

The tab-size property sets the size used to render tab characters in situations where white space is preserved

Roadmap Priority: Medium — Development is likely for a future release.

Adds an optional argument to existing scroll APIs that specifies whether scrolling should be smooth. Also adds a CSS property for this.

The :scope pseudo-class represents any element that is in the contextual reference element set.

Roadmap Priority: Medium — Development is likely for a future release.

Filter effects are a way of processing an element’s rendering before it is displayed in the document.

Introduces logical properties and values that provide the author with the ability to control layout through logical, rather than physical, direction and dimension mappings.

Roadmap Priority: High — We intend to begin development soon.

CSS properties helpful for printed publication.

Extends the selectors with :matches, :has, :not(complex selector), :dir, case insensitive attribute matching and more.

Allows to query the presence and accuracy of the user's pointing input (e.g. for differentiating touch versus mouse). Additionally, allows the page to query whether the user's pointing input supports hover.

Unprefixed version: Microsoft Edge build 10240+

This will update our current implementation, from IE10, to support some of the following: the implicit grid, grid-template-* syntax, subgrids, or grid-gap.

Unprefixed version: Windows Insider Preview Build 16237+

Gradients provide a method to, over a customizable amount of space, transition from one color to another.

Unprefixed version: IE 10+, Microsoft Edge build 10240+

A CSS box model optimized for user interface design. The children of a flex container can be laid out in any direction and can "flex" their sizes to fill unused space and avoid overflowing the parent.

Prefixed version: IE 10+, Microsoft Edge build 10240+

Unprefixed version: IE 11, Microsoft Edge build 10240+

Define areas inline content should avoid, and how inline content should wrap around them.

Prefixed version: IE 10+, Microsoft Edge build 10240+

One dppx unit represents the number of 'dots' in a CSS px.

Unprefixed version: Microsoft Edge build 10240+

Increases interoperability with the web by relaxing domain and licensing metadata restrictions for EOT, WOFF, and TrueType fonts. Development work for IE is currently for Windows Phone only.

Magazine-like content flow into specified regions.

Roadmap Priority: Medium — Development is likely for a future release.

Prefixed version: IE 10+, Microsoft Edge build 10240+

Introduces cascading variables as a new primitive value type that is accepted by all CSS properties, and custom properties for defining them.

Unprefixed version: Microsoft Edge build 15063+

The @viewport rule, in combination with media queries, enabled web developers to optimize the layout of sites and apps for different devices with minimal effort. It generalizes the viewport meta tag to CSS, while being much simpler to understand and without the quirks that exists with the meta tag.

Preview in: by enabling in about:flags

Method of allowing calculated values for length units, i.e. width: calc(100% - 3em)

Unprefixed version: IE 9+, Microsoft Edge build 10240+

The function allows filtering using SVG Filter elements as the filter function.

Allows multiple instances of fonts to be defined by interpolating glyph outlines along different axis.

Roadmap Priority: High — We intend to begin development soon.