In contrast to the visual editor in WordPress, you can not disable the HTML editor. WordPress does not provide a user setting or a global option. Also, there is no hook, to disable the HTML tab above the editor when writing posts or pages.
But there are users who do not need this tab and like to deactivate it globally. Therefore, I have a solution, how you can disable it in your editor.
Alternatively, you can use the Plugin Adminimize, which offers such a possibility per role, just put it in the settings.
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