Insufficient validation in cross-origin communication (postMessage) in reveal.js version 3.9.1 and earlier allow attackers to perform cross-site scripting attacks.
To install App::revealup, copy and paste the appropriate command in to your terminal.
cpanm
cpanm App::revealup
CPAN shell
perl -MCPAN -e shell install App::revealup
For more information on module installation, please visit the detailed CPAN module installation guide.