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I added this text to our internal demo page and checked. It worked fine.
Therefore, it must be something specific for the environment where you noticed the issue. What is it? What is the browser? Have you added any additional plugins?
CKEditor's getData method is expensive to be invoked
on each keyup. It filters the data and when the text is large,
performance will suffer. For that reason a lightweight
method will be used - innerText property of the editable node