Project Spartan isn't here yet, but you can test its updated 'Edge' engine in build 10041

If you’ve downloaded the latest Technical Preview build of Windows 10, you may have noticed that Project Spartan preview is not present in the new release, but there’s a good reason for that, and you can read all about it here.

This is probably not the news you’ve waited for, but there’s still a positive side to this story after all. First, the IE team has mentioned that Insiders will get to test Spartan in the next preview release, which Microsoft said could be less than a month away, if all goes well. Second, Spartan’s rendering engine called EdgeHTML is available in build 10041, and can be tested with Internet Explorer via a toggle in the about:flags page called “Enable experimental Web platform features.”

The IE team said that the March update has several new features and improvements:

  • Improved ECMAScript 6 compatibility (up to 74% in the Kangax ES6 compatibility test in this preview)
  • Expanded support for DOM L3 XPath
  • Support for WAI-ARIA Landmark Roles
  • Support for CSS Conditional Rules (@Supports)
  • Support for the Web Audio API
  • Support for CSS Gradient Midpoints (aka color hints)
  • Improved FeBlend mode support
  • Unprefixed support for the Fullscreen API

There are also some other features either fully or partially implemented, and they can be activated in the about:flags page in Internet Explorer:

  • Support for the Touch Events API. (Touch Events are enabled when a touchscreen is present)
  • Support for the HTML5 Date-Related Inputs API. This is off by default.
  • Partial support for CSS Transitions & Animations on SVG elements

When tested in operation, we found that popular websites work quite well, and the only notable issues are with disappearing controls on embedded Youtube videos, which tends to happen in older builds as well.

Source: IE Blog

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