Implement extended srcset which includes support for the sizes attribute on the image tag and the addition of the width descriptor instead of just the pixel density descriptor inside of the srcset attribute.

Download of virtual machine on dev.modern.ie is not possible. There is a javascript error (i18n is not defined). Please debug it. Thanks

Edge should prevent a page from repeatedly popping up modal dialogs that block action on the current or other tabs. In IE 11, it is possible for a page to pop up a modal OS dialog window, and upon attempting to close that window, simply re-open it. I experienced this today with a rogue fake virus warning page, and had to kill the entire IE process to get rid of the dialog. Simply unacceptable from a security standpoint.

http://dev.w3.org/html5/spec-preview/textFieldSelection.html

I used to use the el.createTextSelection method to determine the selection direction in IE11. However, inputs and textareas no longer expose this method, while still the el.selectionDirection = undefined.
We don't have any way to determine selectionDirection now.

Please create 64-bit VM's (i.e. the free VM's that have different OS and IE versions and last three months before "expiring").

Even on a very fast machine, the http://dev.modern.ie/ virtual machines are slower than they could be due to their 32-bit OS.

So making a 64-bit set available would increase productivity for many users of these VM's.

Another reason for 64-bit VM's is for the ability to test on 64-bit machines (I've seen this mentioned on other message boards about modern.ie VM's).

THANK YOU for providing VM's!

Support for rest parameters in ES6. https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/rest_parameters

The ImageData constructor is particularly useful for creating new image data in a worker.

https://html.spec.whatwg.org/#imagedata

This has been implemented in Firefox (https://bugzilla.mozilla.org/show_bug.cgi?id=959958) and Chromium (https://code.google.com/p/chromium/issues/detail?id=338804). Support in IE would be great.

Please add support for pseudo elements :before and :after for <option> tag in <select>. It works pretty well in all other browsers.
Here is an example for it:
http://jsfiddle.net/skusL38w/

Since Microsoft Edge is a new browser product, with many distinct differences from Internet Explorer, as well as many new features previously unknown in a Microsoft browser, we need an Edge forum to discuss issues and solutions, and where users can get many of their questions answered.

Tell me how I can contact you or 'team' via live chat? (re: Edge glitch(s))

The Fetch specification defines requests, responses, and the process that binds them; fetching.

https://fetch.spec.whatwg.org/
https://status.modern.ie/fetchapi

Though WebVR is not yet standardized, there are now experimental builds of Firefox and Chromium which support Virtual Reality Headsets such as the Oculus Rift.

Relevant links:
https://code.google.com/p/chromium/issues/detail?id=389343
http://mozvr.com/
http://webvr.info/

Just as Chrome does...

You should implement the new cursor properties of CSS3 http://www.w3.org/TR/css3-ui/#cursor, e. g. grab, grabbing, zoom-in and zoom-out to make websites more user friendly.

Other browsers support the new properties since a long time https://developer.mozilla.org/en-US/docs/Web/CSS/cursor#Browser_compatibility.

The symbols for the cursor properties can be found on https://developer.mozilla.org/en-US/docs/Web/CSS/cursor.

I looking for a way to know where has my script been loaded.
The most suprising thing that I could emulate this property through script.readyState, but until IE10, later it has been removed.
Spec: https://html.spec.whatwg.org/multipage/dom.html#dom-document-currentscript
MDN: https://developer.mozilla.org/en-US/docs/Web/API/document.currentScript

Support the standard property document.baseURI. Internet Explorer is the only browser that doesn't.

See: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/base
Also: http://www.w3schools.com/jsref/prop_doc_baseuri.asp

Small, but annoying issue. In Chrome and Firefox focusing an input doesn't clear the placeholder; it only gets cleared when there is text. In IE, it clears when you focus.

This is especially annoying if you want to automatically focus a field and you're using placeholders for labeling your elements since the field you focused is no longer labeled :(