Reloading the page after form submission in POST method, browser will always display a warning whether it can resend same data to server or not. For average user, this information is bit technical and it might confuse him.
Normally if you click on any link in iframe content it will automatically open only within the iframe window. But you make those links to be openend in the parent window or new window by using target property of anchor tag.
Links in iframe will open on the same window by default, but specifying target on base tag we can make all links inside iframe to open in same / new window.
It'll really frustrates, when you find your blog content published in some other websites as their own. We cannot completely block these kind of stealing but we can make it harder to achieve.