What is wasshown property.

Hello All Experts,

I need to know what does the WasShown Means in the below code

var responseObj = Xrm.Page.getAttribute("new_response").getValue();
if (responseObj !== null && responseObj !== undefined) {
if (responseObj.WasShown !== undefined && responseObj.WasShown === true) {
return;
}

Can anyone help me in understanding this.