Audio

See example

The sound in an ad cannot start automatically, because there might be several other ads with sound simultaneously on the site. Sound might also annoy the user.

• Sound may begin with 0,5 second delay, when the mouse pointer is placed on the ad. Delay makes sure the sound will not start if user only drags mouse pointer quickly over the ad.
• Sound must end automatically when user moves the pointer off the ad.
• Optionally there can be separate "sound on" and "sound off" buttons on the ad, so the user may control the sound him/herself. Sound should never be on by default.