See https://drafts.csswg.org/css-overflow-4/#max-lines

But there's still something missing & with vars now supported, it's more important than ever: calc in rotate/scale/for time vals.

https://www.w3.org/TR/css-color-4/#the-hwb-notation

https://developers.google.com/web/updates/2016/05/houdini

At least, Edge should offer the option which ignores 'ime-mode'.

FYI:
CSS Basic User Interface Module Level 3 (CSS3 UI)
W3C Candidate Recommendation, 02 March 2017
https://www.w3.org/TR/css-ui-3/#input-method-editor
> 6.3.2. Obsolete: the ime-mode property
> User agents should not support the ime-mode property.

Couldn't find this anywhere here, so I'll post this feature request.

I'm asking for support of the following notations:

background-color: #12345678;

and

background-color: #1234;

Spec: https://drafts.csswg.org/css-color/#hex-notation

"caret-color" has just been implemented on Chromium and Firefox. It'd be really nice if Edge can support it too.

The spec is CR: https://www.w3.org/TR/css-ui-3/#caret-color

And there are already 21 tests on the W3C csswg-test repo: http://test.csswg.org/shepherd/search/testcase/spec/css-ui-3/section/6.2.1/

The `i` flag is defined in the CSS Selectors module [1] and is supported by all the other major browser engines.

Demo: https://jsbin.com/sonubug/edit?html,css,output

[1]: https://drafts.csswg.org/selectors/#attribute-case

The Writing Mode property has been implemented and updated in the current version of Edge, but it only includes the values of horizontal-tb, vertical-lr and vertical-rl. Two more values provide an easier way for authors to typeset text in a sideways orientation. They are currently implemented in Firefox (since Sept 2015).

https://www.w3.org/TR/css-writing-modes-3/#valdef-writing-mode-sideways-rl

This feature would add support for ::before and ::after pseudo elements in <input> elements. Chrome, Opera, and Safari already support using pseudo elements to embellish inputs without the need for JavaScript and extra divs.

Steps to reproduce the problem:
1. Open the testcase https://bugzilla.mozilla.org/attachment.cgi?id=8443862 in Edge.

What is the expected behavior?
The test should pass.

What went wrong?
The test failed, indicating that Edge does not support the relevant nth-child(An+B of sel) and nth-last-child(An+B of sel) pseudo classes.

Specification: https://drafts.csswg.org/selectors-4/#the-nth-child-pseudo
Chrome Bug: https://bugs.chromium.org/p/chromium/issues/detail?id=304163
Firefox Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=854148
Webkit Status: https://webkit.org/status/#feature-css-selector-:nth-child(an+b-of-selector-list)-and-:nth-last-child(an+b-of-selector-list)
Can I Use: http://caniuse.com/#feat=css-nth-child-of

Add support for image-orientation:from-image. This will allow photos captured on Windows 10 Mobile devices to be displayed with the correct orientation.

To demonstrate the issue, see: https://social.msdn.microsoft.com/Forums/Windowsapps/en-US/78294ed7-7258-4ef2-b90c-2de237f93ba1/uwpxamlhmtl-webview-displaying-captured-photos-with-incorrect-orientation-on-windows-10-mobile?forum=wpdevelop

Scoped Styles via @scope

@scope at-rule to apply a block of rules only within a subtree of the document. The cascade would prioritize scoped rules above unscoped ones, regardless of specificity.

https://drafts.csswg.org/css-scoping/

(This is similar to scoped styles in this post: https://wpdev.uservoice.com/forums/257854-microsoft-edge-developer/suggestions/6508310-scoped-styles -- but the newer revision of the draft uses an at-rule rather than the HTML `scoped` attribute)

Ability to style select options. e.g. I'd like to layout options horizontally instead of vertically (e.g. toggle button style for Yes/No, Male/Female, etc.).

See
- http://caniuse.com/#feat=text-stroke
- https://css-tricks.com/adding-stroke-to-web-text/

- https://developer.mozilla.org/en-US/docs/Web/CSS/-webkit-text-fill-color
- https://developer.mozilla.org/en-US/docs/Web/CSS/-webkit-text-stroke-color
- https://developer.mozilla.org/en-US/docs/Web/CSS/-webkit-text-stroke-width
- https://developer.mozilla.org/en-US/docs/Web/CSS/-webkit-text-stroke

Coming from https://github.com/Fyrd/caniuse/issues/2823

Support vector-effect for SVG elements. vector-effect: non-scaling-stroke would allow strokes to keep the same width as the SVG scales as a whole. https://www.w3.org/TR/SVGTiny12/painting.html#VectorEffectProperty

Implement the :placeholder-shown CSS pseudo-class

- http://caniuse.com/#feat=css-placeholder-shown
- https://drafts.csswg.org/selectors-4/#placeholder