InputBox is widely used for (slightly) interactive workflows on many wikis. Now that we have a standard house style for buttons in the form of the mw-ui-button styles (default, progressive, constructive and destructive styles), we should make these widely-used InputBox buttons use them.
http://tools.wmflabs.org/styleguide/desktop/section-2.html
Per the style guide, probably the two search types (search, fulltext, search2) should use the default white Agora style, while the others which open an edit window for a new page or addition to an existing page (create, comment, commenttitle) should use the progressive style.
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