$browser) - Browser name (not versioned).
Browser Version (
$browser_version) - Browser version number.
$device) - The name of the event sender's device, if they're on mobile web.
Current URL (
$current_url) - The full URL of the webpage on which the event is triggered.
Initial Referrer (
$initial_referrer) - Referring URL at first arrival.
Initial Referring Domain (
$initial_referring_domain) - Referring domain at first arrival.
Operating System (
$os) - OS of the event sender.
Mixpanel Library (
mp_lib) - Mixpanel Library that sent the event.
$referrer) - Referring URL, including your own domain.
Referring Domain (
$referring_domain) - Referring domain, including your own domain.
Screen Height (
$screen_height) - The height of the screen of the device.
Screen Width (
$screen_width) - The width of the screen of the device.
Search Engine (
$search_engine) - Search engine a customer used when they arrived at your domain.
Search Keyword (
mp_keyword) - Search keywords detected on the referrer from a search engine to your domain.
UTM Parameters (
utm_medium, etc.) - Any utm tags associated with the link a customer clicked to arrive at your domain. Each utm will be collected under its own property.