Note: After saving, you have to bypass your browser's cache to see the changes. Google Chrome, Firefox, Microsoft Edge and Safari: Hold down the ⇧ Shift key and click the Reload toolbar button. For details and instructions about other browsers, see Wikipedia:Bypass your cache.
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importScript('User:Dr pda/articlehistory.js'); //[[User:Dr pda/articlehistory.js]]

mw.loader.load('//en.wikipedia.org/w/index.php?title=User%3ADr+pda%2Fprosesize.js&action=raw&ctype=text/javascript'); // [[User:Dr pda/prosesize.js]]