Web Tooltip “universally accepted” linebreak character?

Question

I use \\n to create a linebreak in web tooltip. This works in IE and in Chrome. But Firefox ignores it.

What will work universally as linebreak character in tooltip?

Answer 1

As of Firefox 12 they now support line breaks using the line feed HTML entity:

Test

This works in IE and is correct according to the HTML5 spec for the title attribute.