Interesting thread on Experts Exchange, on how to develop a standard facility to do debugging inside web-pages:
JavaScript: How to print log messages to Firefox JavaScript console in my javascript?
Create JavaScript Debug Console using DIV and innerHTML
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About The Author
Lucas Jellema
Lucas Jellema, active in IT (and with Oracle) since 1994. Oracle ACE Director and Oracle Developer Champion. Solution architect and developer on diverse areas including SQL, JavaScript, Kubernetes & Docker, Machine Learning, Java, SOA and microservices, events in various shapes and forms and many other things. Author of the Oracle Press book Oracle SOA Suite 12c Handbook. Frequent presenter on user groups and community events and conferences such as JavaOne, Oracle Code, CodeOne, NLJUG JFall and Oracle OpenWorld.