Platform status

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.

Unprefixed version: Windows Insider Preview Build 17063+

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.

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.

Support for the @supports at-rule and the "window.CSS.supports()" API

Unprefixed version: Microsoft Edge build 10240+

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.

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.

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.

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

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

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.

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

The function allows filtering an CSS input image with a set of filter functions. The used filter functions are the same as for the CSS filter property. The filter() function can be animated as well.

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

This CSS module describes events and interfaces used for dynamically loading font resources.

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.

Add support for the CSS font-stretch property.

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

A two-dimensional grid-based layout system, optimized for user interface design.

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

Unprefixed version: Microsoft Edge build 16299+

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.

If the cascaded value of a property is the initial keyword, the property’s initial value becomes its specified value.

Unprefixed version: Microsoft Edge build 10565+

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.

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.

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.

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

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

:read-only and :read-write pseudo-classes to match elements which are considered user-alterable for the purposes of Selectors.

Unprefixed version: Microsoft Edge build 10547+

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

Enables control of whether an element can receive input events from a pointing device using an API similar to the existing pointer-events property from SVG.

Unprefixed version: IE 11, Microsoft Edge build 10240+

:in-range and :out-of-range pseudo-classes to match elements that are candidates for constraint validation, have range limitations, and are/are not suffering from underflow or overflow.

Unprefixed version: Microsoft Edge build 10547+

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.

Enables rich, customizable, and performant scrolling experiences like pagination of carousels by using snap points that enforce the scroll offsets that a scroll container may end at after a scrolling operation has completed.

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

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

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.

Augments existing CSS 3d transforms by facilitating the construction of complex 3d scenes.

Unprefixed version: Microsoft Edge build 10240+

If the cascaded value of a property is the ‘‘unset’#’ keyword, then if it is an inherited property, this is treated as ‘inherit’, and if it is not, this is treated as ‘initial’. This keyword effectively erases all declared values occurring earlier in the cascade, correctly inheriting or not as appropriate for the property (or all longhands of a shorthand).

Unprefixed version: Microsoft Edge build 10565+

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

Unprefixed version: Microsoft Edge build 16299+

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.

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

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

Unprefixed version: 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+

Apply filter effects to arbitrary DOM elements.

Unprefixed version: Microsoft Edge build 10586+

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+

Allows authors to utilize longhand properties of font-variant-caps, font-variant-ligatures, font-variant-numeric, font-variant-alternates, font-variant-east-asian, font-variant-position for font selection and adjustments rather than utilizing lower level props such as font-feature-settings.

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

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

Unprefixed version: Windows Insider Preview Build 17074+

CSS properties helpful for printed publication.

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+

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.

Allows the author to set the size and depth at which it sinks into the surrounding text.

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.

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+

Allows to query the device pixel count per CSS unit

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