A note on Quotation Marks.

Usually, when you type in a quotation mark on to a text editor, it is the neutral or straight quotation mark, whick looks the same for both the left and right hand sie of the quoted text. This is the ASCII / Unicode character 22.

However, when the quoted text is copy pasted, some text editor - operating system combinations change the quotes into specific left and right quotes, the Unicode characters 201C and 201D. These characters are interpreted differently by the browser, and you find that the links or url's don't work. If you look closely, these characters will look like fancy quotes, with a slight curve to them compared to the straight quote. Here they are right next to each other. “ " 

If you run into issues where the code looks OK but links or images don't work, delete the quote and type in the quotation marks manually. This should fix the problem.