javascript:__doPostBack('ctl00$cphMainContent$lbStart','') - What is it?

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Just wondering what it is? javascript:__doPostBack('ctl00$cphMainContent$lbStart','') Just saw it in my last comment a while ago and just wondering what it is and where it came from cause I don't really know.I don't even type or paste it so I am quite curious about it. Is there any meaning about it? ^Thanks and have a great day everyone.