What happens if another user (in another gadget) opens your html webpage with your files in it?

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Answer 1

Wdym "with your files in it"?

In case of SoloLearn, only the code author can edit the original code, others can only save a copy of it. Changes only applies in the copy, original code remains intact.

If "your files" is something confidential, do not put it in public space, period.