Hanging punctuation controls the alignment of punctuation marks for a specific paragraph. When Roman Hanging Punctuation is turned on, the following characters appear outside the margins: single quotes, double quotes, apostrophes, commas, periods, hyphens, em dashes, en dashes, colons, and semicolons. When a punctuation character is followed a quotation mark, both characters hang.
Keep in mind that the paragraph alignment determines the margin from which the punctuation hangs. For left-aligned and right-aligned paragraphs, punctuation hangs off the left and right margin, respectively. For top-aligned and bottom-aligned paragraphs, punctuation hangs off the top and bottom margin, respectively. For centered and justified paragraphs, punctuation hangs off both margins.