Fabri said:
I guess if it is possible to write a multiline title attribute
natively with HTML + CSS.
Of course. In HTML, a line break is permitted inside an attribute
value. CSS has nothing to do with this.
What you probably mean, though, is whether you can make browsers
_display_ an attribute value in two (or more) lines with a line break
in a particular position. The answer is that by the specifications you
cannot, though some browsers incorrectly treat a line break as in
title="first line
second line"
as requesting a line break in output, not as equivalent to a space, as
the specifications say.
When in a dead end, backtrack. What was the reason for your wish to
display a title attribute in two lines? It probably indicates a wrong
idea of the attribute. It is an "advisory title" - basically, something
that the user might or might not hear or see and that might sometimes
help her, but it should not contain anything that users _must_ know.