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The Wix Developer Console is available at the bottom of the page when you are previewing your site. The Developer Console displays information that is useful when debugging, such as errors, warnings, and other messages. The Console is collapsed by default unless your code has errors or you logged messages to the console. You can test a release candidate of your published site on a small percentage of visitors using the Release Manager. The Release Manager is helpful for testing functionality that only works on a published site without exposing functionality to all site visitors.