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By toggling the composition on and off, the developer can visually see how many pixels they are off in development.
Selecting the "Lock" option will allow you to inspect elements on the page that are below the active overlay. This is handy if you want to adjust the page in real time to match the active overlay.
The overlay opacity can also be adjusted for specific use cases.
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open licenses to the best of our knowledge. If you are an author and would like anything removed,
then please write an e-mail to legacy [at] collector dot org.