Selenium
A mature open project with browser drivers, Grid parallel execution, and Java, Python, C#, and other bindings.
Why it’s here
Teams with existing test infrastructure reuse it for game sites, dashboards, and web-game shell flows.
Best fit
Testing, performance, accessibility, and diagnostics expose friction before launch.
Before you commit
Synchronization and driver management are more manual than newer frameworks, and canvas internals still need project test interfaces.