Thanks for the clarification, unfortunately we can't reproduce such problem on our end and suspect that this unpleasant effect can be caused by the ability of your monitor to react on the color changes i.e. the response time of its active-matrix. Since you state that you observe this problem only in html files, it is possible that the color scheme used in html files is not handled well by your monitor. Feel free to change it as you best see fit, for more information see Configuring the Color Scheme
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