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Being an amateur programmer and a bit of a perfectionist, I often find myself wondering about capitalization in user interfaces.

If you look towards the top of this very website, you'll notice the links under the "English Language & Usage" banner are all capitalized. Every word, in fact; not just the first word of every link. However, the ones at the very top of the page ("log out," "chat," etc.) have no capitalization.

What is the correct form?

Furthermore, when describing the buttons in a manual, should they be capitalized as if they were proper nouns? For example:

Navigate to the "First Example" pane and click the arrow next to "Second Example." This will bring up a dialog. Now click "Third Example" to perform the task.

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posting as a comment only because I don't know the most proper usage. As one of the designers for this site, I can tell you I used lower-case for the top links for styling purpose. For real "action buttons" I see most sites still capitalized the first word. –  Jin Jan 10 '11 at 6:30
    
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Since nobody seems to have answered this part: when describing buttons in the manual, use quotes (just as you have in your example), and match the capitalisation in the program exactly. –  psmears Jan 10 '11 at 15:01
    
Shouldn't we add a tag "technical" or "technical writing" or "copy-writing"? –  Gennady Vanin Novosibirsk Feb 9 '11 at 3:55
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@Maxpm - I have a couple of pet peeves including "Ok" on buttons instead of "OK" or "ok" (it just looks weird), and the use of Zip instead of ZIP when referring to the US postal code. –  ukayer Feb 9 '11 at 4:36
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3 Answers

up vote 6 down vote accepted

I would go with Stacker's answer. As per the Manual of Style for Technical Publications (MSTP), which is strictly followed by all of Microsoft's manuals, software applications etc., title case uses uppercase for every word in the title except prepositions, conjunctions and articles.

Prepositions that have more than 5 letters such as "During" and "Through" should also be capitalized. Articles that appear in the beginning of a sentence should obviously be capitalized.

Words that appear after colons/semicolons are capitalized as well.

Hyphenated words are capitalized based on consistency. For example, if you start out with "Non-company", you retain the lowercase for 'c' throughout the manual/application. If you start out with "Non-Company", you capitalize the 'C' throughout the manual/application. However, Web 2.0 has broken many of these standards and "log out" has also become acceptable. Ideally it should be "Log out".

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Do you have a link to the MSTP? –  CesarGon Jan 15 '11 at 19:05
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Capitalization does not only apply to menu items, it is usualy part of a style guide which describes almost all elements of a user interface. Microsoft Styleguide

Another one for KDE

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There is no correct form. If you are used to UNIX and C programming, you might be tempted to make your site look like craigslist.org did in its early days. You can do whatever you like.

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