Web Sites and a Plug-in Free Web (IE10 & Metro)

The transition to a plug-in free Web is happening today. Any site that uses plug-ins
needs to understand what their customers experience when browsing plug-in free.
Lots of Web browsing today happens on devices that simply don’t support plug-ins.
Even browsers that do support plug-ins offer many ways to run plug-in free.

Metro style IE runs plug-in free to improve battery life as well as security, reliability,
and privacy for consumers.
Previously, we wrote about how we use IE’s Compatibility View List to make
sure sites that have a plug-in free experience for other browsers provide that same
experience to IE10 users. This post describes a way for sites that continue to rely
on plug-ins to provide consumers browsing with Metro style IE the best possible
experience.

Developers with sites that need plug-ins can use an HTTP header or meta tag to signal
Metro style Internet Explorer to prompt the user.

Source : IEBlog