The error console built-into most modern browsers is a useful tool for diagnosing problems and faults in your website.
Console can usually be accessed with a keyboard shortcut. Below is a list of the keyboard shortcuts which activate the developer console on the most popular web browsers.
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Firefox
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Ctrl + Shift + K
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Chrome
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Ctrl + Shift + I
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Edge
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F12
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You will end up with a console which looks like this:

