It's shown as a tooltip in my IE running on the very same windows 8 tablet.
I want it to be shown as a tooltip when it's possible but omit that description when it's not possible to be shown as a tooltip. Is there any tip to achieve this ?
It appears that Google Chrome thinks that your Windows 8 PC is a touch device.
In chrome://flags/ find "Enable touch events". By default it's set to "Automatic", if you change it to "Deactivated" then everything should work as expected.