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Imagine that you have to create website on your laptop.

With semi-transparent editor window and with live reloading, you are able to modify website code and see instantly how website changes underneath. Without switching apps.

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My favorite variation of this is to have a special keystroke for saving a file and making the window transparent at the same time, then restoring the opacity on the next keystroke. I can see the effect of the live (or hot) reload and then either continue editing or cmd+tab to the browser if I need to interact with it.

A second monitor works even better - one for code, one for the preview.

But it's also more expensive and less portable. The transparency makes it easy as someone who is out and about doing work at coffee shops.

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