r - Split the title onto multiple lines? -

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in r markdown document (html , presentations), possible manually split title onto multiple lines? tried playing pipes produces orrendous output.

--- title:  'a title want split on 2 lines' author:  date:  output:   ioslides_presentation ---

for html output <br> tag while if output pdf or pdf presentation standard latex code break line given \\ should work.

example

--- title:  'a title want <br> split on 2 lines' author:  date:  output:   ioslides_presentation ---

for pdf

just rule out possibilities, i've tried put \\ or \newline, both not split, pdf seems little bit tricky. \linebreak stop knitr parsing. maybe user can solve question knitr pdfs.


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