[Docs] Add warning about XSS #149
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I think it's best _not_ to try to prevent XSS within the demo so users can accurately see the results _without_ any sanitization, but users should at least be able to test things like <img src=x onerror=alert(1)> within the editor without causing infinite loops. Triggering on keyup was causing the alert to be re-fired upon pressing Escape to close it.
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Closes #112