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Pros

Pro Test actual HTML files
You can sandbox your actual html files with a head section, script tags, etc.

Pro Fill size preview
Can open in a fill-sized web page like preview.

Pro Multiple files and file structure
You can simulate actual website structure allowing you to sandbox multiple file situations such as Angular rather than just a single concept such as "how do I make this div work better."
Cons
Con Outdated and confusing UI
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