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For those who want to preview features that are still under development and not yet enabled in production<br />

releases, type about:flags in the address box. That option displays a list of advanced settings<br />

and experimental features, as shown in Figure 6-1.<br />

FIGURE 6-1 Entering about:flags in the Microsoft Edge address bar unlocks these advanced settings.<br />

One of the most important changes in Microsoft Edge is its user-agent string, a primary troubleshooting<br />

tool for determining whether a webpage is rendering incorrectly because it’s coded to sniff<br />

for a particular browser version rather than test for the existence of specific features.<br />

On Windows <strong>10</strong> version 1511, Internet Explorer 11 identifies itself with the following user-agent string:<br />

Mozilla/5.0 (Windows NT <strong>10</strong>.0; Trident/7.0; rv:11.0) like Gecko<br />

In contrast, Microsoft Edge 25 returns this user-agent string with each webpage request:<br />

Mozilla/5.0 (Windows NT <strong>10</strong>.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2486.0<br />

Safari/537.36 Edge/13.<strong>10</strong>586<br />

The changes in user-agent string make it much more likely that a site will serve up the same<br />

standards-compliant page it would serve for other browsers and ignore any Internet Explorer–specific<br />

modifications.<br />

80 CHAPTER 6 Microsoft Edge and Internet Explorer 11

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