Appendix C Tests

In order to better understand how LibreJS works, you can try to visit these pages with LibreJS installed and enabled and see how they are being processed:

• http://lduros.net/assets/librejs/tests/trivial-inline-trivial-external/ This page contains trivial on-page JavaScript code, and an external script that contains trivial JavaScript code. Therefore, all JavaScript is being executed.
• http://lduros.net/assets/librejs/tests/trivial-inline-nontrivial-external/ The on-page script here is trivial and uses a built-in method, but the external script in this page is nontrivial (defines a function.) The external script is blocked, the inline script is executed.
• http://lduros.net/assets/librejs/tests/nontrivial-inline-trivial-external/ This page contains nontrivial code on page, and trivial code in its external page. All JavaScript is removed from the page, and the external script is never analyzed, since the nontrivial conditions are already met in the page.
• http://lduros.net/assets/librejs/tests/free-inline-free-external/ This page contains free on-page (GPL 3) JavaScript, and free external Javascript. Therefore all JavaScript is being executed.
• http://lduros.net/assets/librejs/tests/free-inline-nonfree-nontrivial-external/ This page contains free on-page JavaScript. The external script contains nonfree nontrivial JavaScript (AJAX request). The free code that is inline is executed, but the external file is blocked.
• http://lduros.net/assets/librejs/tests/intrinsec-event/ This page contains trivial on-page code, with an intrinsic event in an html attribute (onload). All JavaScript is being executed.
• http://lduros.net/assets/librejs/tests/trivial-inline-free-external-defines-function/ This page contains on-page trivial JavaScript (only makes a window alert and loads an external script using the html <script> tag with the src attribute. The external script is free (GPL v3), and since it is only nontrivial because it defines a function, the on-page trivial code is allowed to use it. All JavaScript is being executed.
• http://lduros.net/assets/librejs/tests/trivial-inline-free-external-writes-script/ This page contains trivial on-page JavaScript code, and loads an external script that is free. Since no function is defined, the external script is being analyzed. The external script is free. Trivial here is not allowed because the external script, although free, writes a script. The inline trivial script should also have a free license notice for it to be interpreted.
• http://lduros.net/assets/librejs/tests/shelltypist/demo/real-life-example-with-jquery-free.html This is a real-life example of a small jQuery plugin. The on-page JavaScript code has a free license. The jQuery external file has a free licensed. The shelltypist.js file has a free license as well. All licenses are defined between @licstart and @licend. All JavaScript is executed.
• http://lduros.net/assets/librejs/tests/shelltypist/demo/same-page-without-free-license.html This is the same page than the previous example, except it does not have a free license for the main HTML page on-page script. While the actual code there is trivial, since jQuery defines methods that make use of AJAX, trivial code is not allowed, and no JavaScript is executed.
• http://lduros.net/assets/librejs/tests/test-labels/ This page contains JavaScript (jQuery minified) that does not have proper license information in the file, as it has no @licstart @licend comment. It would be considered nonfree, however, the page itself uses the JavaScript Web Labels method. On the page itself, you will find a link labeled “JavaScript License Information”, which leads to a page that contains a properly formatted table with the required data on the external JavaScript file. LibreJS visits this link and determines the version of jQuery linked from the original page is the one listed there, and flags it as free. All JavaScript is executed (and the title should turn green.)