I believe you need to be running iOS 8 and Yosemite.
If you're on a Mac, just go to the tabs overview (zoom out on a page while already fully zoomed out) and you'll see a list of the tabs open on other devices at the bottom. Hover and tap the × to close it.
If you're on an iOS device, go to the tabs overview as normal, scroll to the bottom and you'll see a similar list of tabs open on other devices. Swipe on one of the items and a "Delete" button will appear.
I hope that helps :) It's rather fun to watch a tab disappear when you close it on another device!
I believe you need to be running iOS 8 and Yosemite.
If you're on a Mac, just go to the tabs overview (zoom out on a page while already fully zoomed out) and you'll see a list of the tabs open on other devices at the bottom. Hover and tap the × to close it.
If you're on an iOS device, go to the tabs overview as normal, scroll to the bottom and you'll see a similar list of tabs open on other devices. Swipe on one of the items and a "Delete" button will appear.
I hope that helps :) It's rather fun to watch a tab disappear when you close it on another device!