User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US) AppleWebKit/534.7 (KHTML, like Gecko) Chrome/7.0.517.41 Safari/534.7 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.10) Gecko/20100914 Firefox/3.6.10 GTB7.1 ( .NET CLR 3.5.30729) In strings passed to alert(), confirm() and prompt() (as well as any similar functions in Javascript or other scripting languages), line breaks (e.g. newlines and carriage returns) should constitute UBA paragraph breaks. This is the correct behavior according to the Unicode standard <http://unicode.org/reports/tr9/>, and is what happens in IE, Webkit and Opera (the last as of 10.63). Reproducible: Always Steps to Reproduce: Open the attached test case, which does alert('I like א.\n(ב is cool too.)'). Actual Results: The dialog looks like: I like א.‏ ‏(ב is cool too.) Expected Results: The dialog should look like: I like א. ‎(ב is cool too.) * <http://www.w3.org/International/docs/html-bidi-requirements/#newline-as-separator> * <http://www.w3.org/Bugs/Public/show_bug.cgi?id=10813> * <https://bugzilla.mozilla.org/show_bug.cgi?id=607541>

This is just bug 607541. The string is shown inside an element with preformatted whitespace.