Create a Course Ensure Tiny Editor is the default editor. Add a "Text and media area" In the Tiny Editor open the Equation editor (Tiny Menu  > Insert >  Equation editor) Enter the following in the modal textarea: x\ =\ \frac{\sqrt{144}}{2}\ \times\ (y\ +\ 12) Confirm the Equation preview is loaded successfully and MathJax replaces all the math symbols Open your developers tools in your browser to the console tab In the equation editor type a sentence (doesn't matter what) Confirm that the following message only shows occasionally and not once per character you type The core/event::notifyFilterContentUpdated() function has been moved to core_filters/events::notifyFilterContentUpdated. Please update your code to use the new module. For example if you type "Hello" quickly it should only show once. Before this it would have a number on the left-hand-side for each character, e.g. 5 [triangle] The core/event::notifyFilterContentUpdated() function has been moved to core_filters/events::notifyFilterContentUpdated. Please update your code to use the new module.