tokens: The iframe gets a height value for unknown reason to me , to give it a height value such as 0 did the trick , The doc.body.style.cssText overwrites the height value to 100% anyway , so you do n't need to worry .
ner_tags: O B-Variable O O B-Variable O O O O O O O O O O O B-Variable O O O B-Value O O O O O B-Variable O O B-Variable O O B-Value O O O O O O O O O O