alert() statements to a section of code, swtching from editor to terminal window in order to rerun my minification script (which also puts the minified code into the right place for downloading), then switching from terminal window to Firefox, hitting refresh to update the cached copy of the code, then typing some stuff into a form and submitting it, all so that I could observe the result of some check or another in the resulting dialogue box.
So now I just hit that page, pop in my test code (calling the
output() function to send results to the output area) and click "Run". I tested it in Firefox, Safari and Chrome and it worked fine. Should work fine on the other browsers as well.