[HTML5] HTML file inclusion

[Master Leep]

HTML5 contains a couple of elements which create nested browsing contexts,
namely iframe and object.

Do either of these elements provide a safe replacement for Javascript
client-side file inclusion?

For example, I'd like to have an element which will be replaced by the HTML
in another referenced document.  I don't want to have to specify height or
width from the parent document or risk having scrollbars appear, if those
scrollbars wouldn't appear if the HTML had been all one document.
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