This article will focus on debugging JavaScript code within Opera’s Developer Tools. It’s important to note that since Opera switched to the Blink rendering engine (a fork of WebKit) in 2013 the debugging tools and process is identical to Chrome. This is great news as there are huge amount of resources published about Chrome’s Dev Tools which are 100% applicable to debugging in Opera.

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Debug JavaScript in Opera in 7 easy steps [2019]
1.25 GEEK