Explain ERB space removal. [ci skip]
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@ -33,7 +33,9 @@ module ActionView #:nodoc:
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#
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# If you absolutely must write from within a function use +concat+.
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#
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# <%- and -%> suppress leading and trailing whitespace, including the trailing newline, and can be used interchangeably with <% and %>.
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# When on a line that only contains whitespaces except for the tag, <% %> suppress leading and trailing whitespace,
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# including the trailing newline. <% %> and <%- -%> are the same.
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# Note however that <%= %> and <%= -%> are different: only the latter removes trailing whitespaces.
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#
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# === Using sub templates
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#
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