https://www.w3schools.com/jsrEF/event_onmouseout.asp
onmouseout Event
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event
https://bugzilla.mozilla.org/show_bug.cgi?id=184727
184727 - javascript initial problem with onmouseout
RESOLVED (saari) in Core - DOM: Events. Last updated 2002-12-16.
javascriptinitialproblem
https://na.gateway.mastercard.com/api/documentation/apiDocumentation/session/version/42/hs-callback/onMouseOut.html?locale=en_US
Session callback: onMouseOut
sessioncallback