View a course with > 20 participants enroled in it Navigate to the Course participants page Open the browser console In the "Console" tab run: require(['core_table/dynamic'], d => { document.addEventListener(d.Events.tableContentRefreshed, e => { window.console.log(e); debugger; }); }); In the page, choose a different page of the list of participants Confirm that the page refreshed Confirm that a "CustomEvent" was shown in the browser console Expand out the CustomEvent that was dislayed Confirm that you see a target With the source paused run: e.target; Find the specified target in the Elements panel: In most browser there will be some way to inspect the Node in "Elements" panel, for example in Chrome you can right click and choose "Reveal in elements panel" Confirm that the target is the table that was updated