Add example of arbitrary iframed content?

[jasonfine]

Would be helpful to see how you'd approach this. Loading 'any other' iframed content that's not an image or video.

Use case being an anchor tag with the href being opened in the modal. I could see crafting something with the 'advanced usage' documentation, but native support for this would be pretty cool. Currently Modally doesn't seem to like if there's anything other than the modal ID in the href attribute so this poses an issue with trying to make existing anchor links opt-in to being opened in Modally.