What does ==$0 (double equals dollar zero) mean in Chrome …
https://stackoverflow.com/questions/36999739/what-does-0-double-equals-dollar-zero-mean-in-chrome-developer-tools
WebMay 3, 2016 · This is Chrome's hint to tell you that if you type $0 on the console, it will be equivalent to that specific element. Internally, Chrome maintains a stack, where $0 is the selected element, $1 is the element that was last selected, $2 would be the one that was selected before $1 and so on. Here are some of its applications:
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