<p></p>
<p>Only one of the two buttons is greyed out here, so a user can toggle between edit and preview mode. Enabling both of them at the same time isn't a good idea, as a user typically wouldn't want to switch from a Preview mode to the same Preview mode they're already in.</p>
<p>Note that by removing <em>deemphasized</em> (that's what you called greyed out), the Preview button will look like two other buttons "Save" and "Subscribe" we have on that same screen.</p>
<p><a target="_blank" rel="noopener noreferrer" href="https://user-images.githubusercontent.com/5842757/80864891-02e09380-8c86-11ea-81bb-87a25728c541.png"><img src="https://user-images.githubusercontent.com/5842757/80864891-02e09380-8c86-11ea-81bb-87a25728c541.png" alt="deem" style="max-width:100%;"></a></p>
<p><a href="https://github.com/openstreetmap/openstreetmap-website/blob/master/app/helpers/application_helper.rb#L33-L34">https://github.com/openstreetmap/openstreetmap-website/blob/master/app/helpers/application_helper.rb#L33-L34</a></p>

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