title: make iframe height fit content
body: <p>How would I make an iframe's height adjust to the content within it? I assume you'd calculate the difference between the content height and iframe height (something I don't know how to do) and use that with a while loop to increment a variable to use as a height, but I can't wrap my head around how to actually do these things. Before asking: yes, the content in the frame is from my site. Not cross-domain.</p>