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Apparently if you run something like wth:alert('hi') from the console it just works, cross-browser.
The whatever: bit behaves like window. when used in the start of statements, for that matter.
I think it has no use, but I’m curious. Can’t find any explanation or a relevant operator.
What you’re seeing here is a label.
They’re used for the most frowned upon flow control methods – namely
goto(which luckily isn’t supported in Javascript). The general usage of those is for directly instructing the program to “jump” to a position in code which inadvertently leads to spaghetti code.