Getting body tag string value in iFrame using javaScript only

Hello Everyone i am new to javascript and currently facing an issue in getting values of multiple <p> tags from a particular iFrame

[This iFrame is inside HTML tag and i need to get string values inside this iFrame->body.]

Can anyone suggest me any approach to get values ?

For Every new line it add <p></p> Currently am using : `NodeList elementsTextArea = Document.get().getElementsByTagName("iframe");

com.google.gwt.dom.client.Element element = elementsTextArea.getItem(3);`

I do not know what to do forward to get values inside iFrame -> body