Markup to test (permalink, save, upload, download, hide): <!DOCTYPE html> ... DOM view (hide, refresh): Rendered view: (hide): innerHTML view: (show, refresh): <!DOCTYPE HTML><html></html> Log: (hide): Script not loaded. This script puts a function w(s) into the global scope of the test page, where s is a string or object to output to the log. Some files are available for testing purposes, notably