These bookmarklets let you see how a web page is coded without digging through the source, debug problems in web pages quickly, and experiment with CSS or JS without editing the actual page.
CPAINT (Cross-Platform Asynchronous INterface Toolkit) is a true AJAX (Asynchronous JavaScript XML) and JSRS (JavaScript Remote Scripting) implementation that supports both PHP and ASP/VBscript.
S. Sarsa, P. Denny, A. Hellas, und J. Leinonen. Proceedings of the 2022 ACM Conference on International Computing Education Research - Volume 1, Seite 27-43. ACM, (August 2022)
G. Nelson, B. Xie, und A. Ko. Proceedings of the 2017 ACM Conference on International Computing Education Research, ACM, (August 2017)Understand code before write code - tracing and examples first.