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MICROSOFT_PRESS_EBOOK_INTRODUCING_WINDOWS_10

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EdgeHTML, interoperability is even more important: Microsoft says its developers have invested<br />

significant effort in EdgeHTML to help developers avoid having to deal with cross-browser<br />

inconsistencies.<br />

■■<br />

Trident (Mshtml.dll), the rendering engine that has been part of Internet Explorer for two<br />

decades, will continue to be available as a stable, consistent web platform for use in Internet<br />

Explorer 11. Trident will continue to receive security and compatibility updates for all supported<br />

Windows platforms, including Windows <strong>10</strong>. It will not, however, add new features or support<br />

for additional web standards; those development efforts are reserved exclusively for the new<br />

rendering engine and Microsoft Edge.<br />

Note For a detailed list of the status of web-standards support in both rendering engines,<br />

see https://status.modern.ie. Standards that are implemented only in EdgeHTML are currently<br />

identified as Preview Release. With a few exceptions, standards that are listed as<br />

Under Consideration or In Development (Touch Events, for example) will be available only in<br />

EdgeHTML.<br />

For a graphic illustration of the common code that underlies the two browsers, check the properties<br />

for each file (as found in C:\Windows\System32). Note that the Product Version is identical for each, as<br />

shown here.<br />

Even by the accelerated standards of Windows <strong>10</strong> development, Microsoft Edge is developing at a<br />

rapid pace. It was a relatively late addition to the Windows <strong>10</strong> Technical Preview, showing up under the<br />

code name “Project Spartan” in publicly available preview builds some five months after the program<br />

began.<br />

The first official release of Microsoft Edge coincided with the general availability of Windows <strong>10</strong> in<br />

July 2015. In November 2015, Microsoft released a major platform update for Microsoft Edge, bringing<br />

the browser to version 25 and the EdgeHTML rendering engine to version 13; this release also adds<br />

major improvements to Chakra, the JavaScript engine that powers Microsoft Edge.<br />

Version information is available under the Settings menu in Microsoft Edge.<br />

CHAPTER 6 Microsoft Edge and Internet Explorer 11 79

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