Taken from Pym.js Documentation. In addition also check out the iframe documentation.
frameOptions(xdomain = "*", title = NULL, name = NULL, id = NULL,
allowfullscreen = FALSE, sandbox = NULL, lazyload = FALSE)
xdomain to validate messages received.
If passed it will be assigned to the iframe title attribute.
If passed it will be assigned to the iframe name attribute.
If passed it will be assigned to the iframe id attribute.
If TRUE it will set the iframe allowfullscreen attribute to true.
If passed it will be assigned to the iframe sandbox attribute.
If TRUE the child widget is lazy loaded using bLazy.js.