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SlapShot is a new extension written for Expression Web 4. For those of you who already use the SnapShot panel (a feature that debuted in Expression Web 3), you will feel right at home with SlapShot.

For those of you who haven’t yet used SnapShot (or who need a quick refresher course), SnapShot is a panel in Expression Web that displays an image of the current page as rendered by the selected browser. It allows you to easily change the browser and browser resolution without having to repeatedly preview in browser to see your changes.

SlapShot is based on the same premise in that you can easily preview a page without loading a browser, however SlapShot extends the features of SnapShot by including full ActiveX support (Silverlight®, Flash®, and so on), as well as interactivity within the page (including navigation).

In the following screenshot, you can see that SnapShot displays only the Install Silverlight message but SlapShot displays (with interaction) the actual Silverlight content.

More at: SlapShot for Expression Web 4 – Expression Web team blog – Site Home – MSDN Blogs