Creates a lousy JavaScript playground and places it in elem. texts represents the
texts used in the playground. Default texts are used when some texts are left unspecified. All text IDs and
meanings are the following:
code: The placeholder text on the code entry column.
run: The text on "run the code" button.
result: The placeholder text on the execution result field.
reset: The text on "reset the outputs" button.
Playground - feel free to use the above objects!
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