css

Add css so you can show some hidden element, start with "inIframe:" then this css will effect only in next iframe page

Example1:

"css": ".card-lazy{display:none}" 

Example2:

"css": "inIframe:.card-lazy{display:none}" 

Add css to next iframes only.

Example3:

"css": ".card-lazy{display:block}inIframe:.card-lazy{display:none}" 

Add .card-lazy{display:block} to current page and add .card-lazy{display:none} to next iframes.