An example of a mistake that causes a warning is assigning a value to a variable that's un-
pi = 3.142;
Warnings and exceptions are presented differently in various browser environments. Some
of them will show a small icon in the corner of the browser window to indicate that an ex-
ception or warning has occurred, whereas others require the console to be open to see any
warnings or exceptions.
run (although possibly incorrectly).
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