The same way the first letter is often larger and ornate, the first word, few words, or even the first line can be formatted in capitals. It is purely a formatting custom, to make the books look "nicer", it's not a spelling rule or similar.
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Then yesterday I purchased a Kindle book from Amazon, published by Simon and Schuster, and the ENTIRE FIRST LINE AND TWO OR THREE WORDS from the second line of every beginning chapter in a subsection is capitalized.
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This is an example of when it goes wrong. It's OK to have the first line in caps or small caps, but only if you can ensure it will be
just the first line. Hardcoding in caps the first dozen of words is dumb. Moreover, hardcoding the caps should be avoided, and CSS styling preferred.