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A list of tag names that should automatically have their newlines
preserved using the {Haml::Helpers#preserve} helper. This means that any
content given on the same line as the tag will be preserved. For example,
`%textarea= "Foo\nBar"` compiles to `<textarea>Foo&#x000A;Bar</textarea>`.
Defaults to `['textarea', 'pre']`. See also
{file:REFERENCE.md#whitespace_preservation Whitespace Preservation}.
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