How can I use a multiline value for an HTML tag attribute? (i.e. how do I escape newline?)
From what I remember about the HTML standard, character entities work in attributes, so this might work:
<sometag someattr="This is a multiline string. This is the part after the newline." />I'm not sure if the "newline" you want ought to be (\n) or (\r\n), and I'm not sure if browsers will interpret it the way you want.
Why do you need it? What specific problem are you trying to solve by adding a newline in an HTML tag attribute?
To include a multiline value, just continue the text of the html attribute on the next line in your editor e.g.
<input type="submit" value="hallohallo"> will put the second hallo under the first
As a general rule newlines in attributes are preserved so your second example would work fine. Did you try it? Can you give a specific example where you are having problems with it?
As test take a look at this:-
<a href="somepage3.html" onclick="javascript: alert(this.getAttribute('thing'))" thing="This is a multiline string.This is the part after the newline.">some link</a>The alert include the newline in the attribute.