Although the overall technical correctness of this article is good there is a glaring error in the narrative. There is no such thing as a "single quote" mark. There is an apostrophe mark and there is a quotation mark. A single quote looks thusly " and a double quote looks this way "". What the article’s author refers to as a "single quote" is in reality an apostrophe mark ' and what is referred to as a "double quote" is actually a quotation mark.

I bring this up because the difference is really quite significant. Calling an apostrophe a "single quote" is, putting it simply, quite wrong. It would be like calling a “V” a single “W” and calling a “W” a “double W”.

When looking up "quotation marks" in the Oxford Online Dictionary, http://oxforddictionaries.com/words/punctuation, I see no punctuation mark labeled as "single quote". Nor is there a mention of a "double quote".

Yes, I'm tilting windmills. But one must try occasionally, mustn't one?

Thanks for the soapbox.