Whitelist iFrame Domains in Pressbooks
add_filter( 'pb_whitelisted_domains', 'pb_add_iframe_srcs');
function pb_add_iframe_srcs ($whitelistedDomains){
array_push($whitelistedDomains,'vcu.kanopy.com');
return $whitelistedDomains;
}
PressBooks has a filter that runs in prior to the kses filter and that was removing iframes that we wanted to remain. This bit of PHP in a plugin adds a single domain to the list. If you needed to add a bunch array_merge would let you do that easily.
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