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This is fixed. What went wrong? When we insert an editor into a page on a site that includes MathJax, we inject some JavaScript that looked like this: loadMathJaxEditorFeatures() .done(() => { Editor.creationCallbacks.add((editor) => { configureEditorWithMathJaxFeatures(editor); }); }); Basically, this lazy loads the features needed ...


I can't reproduce this in other browsers, so my money's on IE11 doing something funky. It's just about at the tail end of its life and the issue looks to be fairly minor, so we're not going to be addressing it at this time.

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