How to set multiline text in a description element by js

I want a multiline static text display.
but lable element seems not support that.

I'm confused by the online document of description element:

The value attribute is used to set text that appears in a single line. If text appears as a child of the description, it will wrap to multiple lines. If may contain arbitrary markup, which can be styled as needed.


Yes , <description>my multiline text</description> would works.
The question is how can I set "my multiline text" in my javacript source code?

And help would be appreciated!


asong
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