When you're developing for Touch devices, you might want to test interactions directly in your browser.
Google Chrome is a fantastic browser and provides a nice way to achieve this with the Developer Tools.
Activate the Developer Tools with CMD+ALT+i (OSX) or F12 (Windows). Click the cog icon to open up it's settings.
Then switch to the Overrides tab. Make sure Enable is checked and then activate Emulate touch events.
You're done. Now you can fire touch events by holding down your mouse and draw a gesture. Hold it and drag down to fire a Swipe Down for example.
What about emulating touch events in Firefox?
With the Firefox OS Simulator 4.0 (released this summer), you're able to launch a simulator which allows you to test your mobile websites and applications including touch events. Since it's still an alpha version, you have to expect some glitches and bugs. There's also a bookmarklet you can use to simulate touch events.
Not only for developers
This know-how is also useful, if you're not a developer. For example you can create a touch prototype with Frontify and test it right in your browser. Just define some touch interactions (via Interactions layer) and open up the Viewer (Press View button in the project view). Have Fun!
Multi-Touch Web Development (HTML5Rocks)