Well that depends on the tablet you have, so the next question when you select tablet-to-tv would be "Which tablet do you have"? Because a Nexus 7 doesn't have any HDMI ports, so you'd have to get a Chromecast or something (too technical).
When you select computer to TV, it asks whether your computer has a port like this (this being a picture of a HDMI port.) I see no reason why they couldn't do the same for a tablet.
