What possibilities exist for testing DOM manipulations without modifications to production code?

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Suppose I got a file index.html. I would like to be able to use the DOM of this file to test the DOM-manipulation capabilities of some javascript. Is there a way to achieve this such that I do

• not have to make changes to index.html


• I don't need to introduce redundancy i.e. I do not have to copy index.html as a whole or in part.

Best regards

asked 35 secs ago

user2820379

419